Data updated 2026-10-07

ZIP Codes in Maryland

Area economic statistics for 347 ZIP Codes in Maryland.

01 — ZIP Codes

ZIP Codes in Maryland
ZIP	Place	County	Population
20601	Waldorf, MD	Charles County, Maryland	26,945
20602	Waldorf, MD	Charles County, Maryland	28,331
20603	Waldorf, MD	Charles County, Maryland	31,844
20607	Accokeek, MD	Prince George's County, Maryland	13,750
20611	Bel Alton, MD	Charles County, Maryland	1,219
20613	Brandywine, MD	Prince George's County, Maryland	17,590
20616	Bryans Road, MD	Charles County, Maryland	8,057
20618	Bushwood, MD	St. Mary's County, Maryland	1,705
20619	California, MD	St. Mary's County, Maryland	14,212
20620	Callaway, MD	St. Mary's County, Maryland	1,115
20622	Charlotte Hall, MD	Charles County, Maryland	5,185
20623	Cheltenham, MD	Prince George's County, Maryland	2,761
20629	Dowell, MD	Calvert County, Maryland	1,150
20634	Great Mills, MD	St. Mary's County, Maryland	7,088
20636	Hollywood, MD	St. Mary's County, Maryland	10,486
20637	Hughesville, MD	Charles County, Maryland	6,133
20639	Huntingtown, MD	Calvert County, Maryland	15,544
20640	Indian Head, MD	Charles County, Maryland	10,685
20646	La Plata, MD	Charles County, Maryland	21,400
20650	Leonardtown, MD	St. Mary's County, Maryland	16,094
20653	Lexington Park, MD	St. Mary's County, Maryland	26,852
20657	Lusby, MD	Calvert County, Maryland	20,699
20659	Mechanicsville, MD	St. Mary's County, Maryland	24,324
20662	Nanjemoy, MD	Charles County, Maryland	2,129
20664	Newburg, MD	Charles County, Maryland	3,138
20670	Patuxent River, MD	St. Mary's County, Maryland	2,046
20675	Pomfret, MD	Charles County, Maryland	1,796
20676	Port Republic, MD	Calvert County, Maryland	3,218
20677	Port Tobacco, MD	Charles County, Maryland	2,088
20678	Prince Frederick, MD	Calvert County, Maryland	12,752
20685	Saint Leonard, MD	Calvert County, Maryland	6,866
20688	Solomons, MD	Calvert County, Maryland	1,290
20689	Sunderland, MD	Calvert County, Maryland	1,809
20690	Tall Timbers, MD	St. Mary's County, Maryland	1,077
20693	Welcome, MD	Charles County, Maryland	1,496
20695	White Plains, MD	Charles County, Maryland	16,407
20705	Beltsville, MD	Prince George's County, Maryland	28,713
20706	Lanham, MD	Prince George's County, Maryland	42,612
20707	Laurel, MD	Prince George's County, Maryland	37,278
20708	Laurel, MD	Prince George's County, Maryland	27,593
20710	Bladensburg, MD	Prince George's County, Maryland	9,801
20711	Lothian, MD	Anne Arundel County, Maryland	7,731
20712	Mount Rainier, MD	Prince George's County, Maryland	9,563
20714	North Beach, MD	Calvert County, Maryland	4,525
20715	Bowie, MD	Prince George's County, Maryland	26,915
20716	Bowie, MD	Prince George's County, Maryland	22,362
20720	Bowie, MD	Prince George's County, Maryland	25,015
20721	Bowie, MD	Prince George's County, Maryland	31,032
20722	Brentwood, MD	Prince George's County, Maryland	6,264
20723	Laurel, MD	Howard County, Maryland	36,866
20724	Laurel, MD	Anne Arundel County, Maryland	19,369
20732	Chesapeake Beach, MD	Calvert County, Maryland	10,722
20733	Churchton, MD	Anne Arundel County, Maryland	2,669
20735	Clinton, MD	Prince George's County, Maryland	37,464
20736	Owings, MD	Calvert County, Maryland	9,960
20737	Riverdale, MD	Prince George's County, Maryland	24,489
20740	College Park, MD	Prince George's County, Maryland	36,847
20742	College Park, MD	Prince George's County, Maryland	4,350
20743	Capitol Heights, MD	Prince George's County, Maryland	41,093
20744	Fort Washington, MD	Prince George's County, Maryland	54,441
20745	Oxon Hill, MD	Prince George's County, Maryland	28,605
20746	Suitland, MD	Prince George's County, Maryland	27,156
20747	District Heights, MD	Prince George's County, Maryland	38,301
20748	Temple Hills, MD	Prince George's County, Maryland	40,338
20751	Deale, MD	Anne Arundel County, Maryland	2,851
20754	Dunkirk, MD	Calvert County, Maryland	7,545
20755	Fort George G Meade, MD	Anne Arundel County, Maryland	11,225
20759	Fulton, MD	Howard County, Maryland	6,624
20762	Andrews Air Force Base, MD	Prince George's County, Maryland	3,130
20763	Savage, MD	Howard County, Maryland	2,601
20764	Shady Side, MD	Anne Arundel County, Maryland	2,993
20769	Glenn Dale, MD	Prince George's County, Maryland	6,947
20770	Greenbelt, MD	Prince George's County, Maryland	28,384
20772	Upper Marlboro, MD	Prince George's County, Maryland	54,319
20774	Upper Marlboro, MD	Prince George's County, Maryland	51,816
20776	Harwood, MD	Anne Arundel County, Maryland	3,315
20777	Highland, MD	Howard County, Maryland	3,221
20778	West River, MD	Anne Arundel County, Maryland	2,211
20781	Hyattsville, MD	Prince George's County, Maryland	13,352
20782	Hyattsville, MD	Prince George's County, Maryland	34,293
20783	Hyattsville, MD	Prince George's County, Maryland	50,333
20784	Hyattsville, MD	Prince George's County, Maryland	33,831
20785	Hyattsville, MD	Prince George's County, Maryland	40,066
20794	Jessup, MD	Howard County, Maryland	16,814
20814	Bethesda, MD	Montgomery County, Maryland	32,795
20815	Chevy Chase, MD	Montgomery County, Maryland	30,505
20816	Bethesda, MD	Montgomery County, Maryland	18,140
20817	Bethesda, MD	Montgomery County, Maryland	37,454
20818	Cabin John, MD	Montgomery County, Maryland	1,539
20832	Olney, MD	Montgomery County, Maryland	25,553
20833	Brookeville, MD	Montgomery County, Maryland	7,860
20837	Poolesville, MD	Montgomery County, Maryland	6,699
20841	Boyds, MD	Montgomery County, Maryland	9,969
20842	Dickerson, MD	Montgomery County, Maryland	2,369
20850	Rockville, MD	Montgomery County, Maryland	50,353
20851	Rockville, MD	Montgomery County, Maryland	14,946
20852	Rockville, MD	Montgomery County, Maryland	48,180
20853	Rockville, MD	Montgomery County, Maryland	31,851
20854	Potomac, MD	Montgomery County, Maryland	50,498
20855	Derwood, MD	Montgomery County, Maryland	17,279
20860	Sandy Spring, MD	Montgomery County, Maryland	2,035
20861	Ashton, MD	Montgomery County, Maryland	2,890
20866	Burtonsville, MD	Montgomery County, Maryland	15,986
20871	Clarksburg, MD	Montgomery County, Maryland	30,182
20872	Damascus, MD	Montgomery County, Maryland	13,983
20874	Germantown, MD	Montgomery County, Maryland	62,738
20876	Germantown, MD	Montgomery County, Maryland	26,406
20877	Gaithersburg, MD	Montgomery County, Maryland	38,546
20878	Gaithersburg, MD	Montgomery County, Maryland	66,115
20879	Gaithersburg, MD	Montgomery County, Maryland	25,264
20882	Gaithersburg, MD	Montgomery County, Maryland	13,751
20886	Montgomery Village, MD	Montgomery County, Maryland	34,718
20895	Kensington, MD	Montgomery County, Maryland	19,184
20901	Silver Spring, MD	Montgomery County, Maryland	36,435
20902	Silver Spring, MD	Montgomery County, Maryland	54,261
20903	Silver Spring, MD	Montgomery County, Maryland	24,815
20904	Silver Spring, MD	Montgomery County, Maryland	58,646
20905	Silver Spring, MD	Montgomery County, Maryland	19,004
20906	Silver Spring, MD	Montgomery County, Maryland	70,595
20910	Silver Spring, MD	Montgomery County, Maryland	45,943
20912	Takoma Park, MD	Montgomery County, Maryland	25,749
21001	Aberdeen, MD	Harford County, Maryland	27,168
21005	Aberdeen Proving Ground, MD	Harford County, Maryland	2,202
21009	Abingdon, MD	Harford County, Maryland	33,679
21012	Arnold, MD	Anne Arundel County, Maryland	22,570
21013	Baldwin, MD	Baltimore County, Maryland	5,610
21014	Bel Air, MD	Harford County, Maryland	38,707
21015	Bel Air, MD	Harford County, Maryland	30,013
21017	Belcamp, MD	Harford County, Maryland	6,648
21028	Churchville, MD	Harford County, Maryland	3,103
21029	Clarksville, MD	Howard County, Maryland	13,607
21030	Cockeysville, MD	Baltimore County, Maryland	25,827
21032	Crownsville, MD	Anne Arundel County, Maryland	8,850
21034	Darlington, MD	Harford County, Maryland	2,846
21035	Davidsonville, MD	Anne Arundel County, Maryland	7,879
21036	Dayton, MD	Howard County, Maryland	2,569
21037	Edgewater, MD	Anne Arundel County, Maryland	20,854
21040	Edgewood, MD	Harford County, Maryland	24,960
21042	Ellicott City, MD	Howard County, Maryland	43,327
21043	Ellicott City, MD	Howard County, Maryland	48,525
21044	Columbia, MD	Howard County, Maryland	44,114
21045	Columbia, MD	Howard County, Maryland	40,034
21046	Columbia, MD	Howard County, Maryland	15,608
21047	Fallston, MD	Harford County, Maryland	13,852
21048	Finksburg, MD	Carroll County, Maryland	10,481
21050	Forest Hill, MD	Harford County, Maryland	17,466
21053	Freeland, MD	Baltimore County, Maryland	2,929
21054	Gambrills, MD	Anne Arundel County, Maryland	16,386
21057	Glen Arm, MD	Baltimore County, Maryland	4,386
21060	Glen Burnie, MD	Anne Arundel County, Maryland	39,730
21061	Glen Burnie, MD	Anne Arundel County, Maryland	57,230
21074	Hampstead, MD	Carroll County, Maryland	14,777
21075	Elkridge, MD	Howard County, Maryland	37,363
21076	Hanover, MD	Anne Arundel County, Maryland	24,268
21078	Havre De Grace, MD	Harford County, Maryland	20,030
21084	Jarrettsville, MD	Harford County, Maryland	7,070
21085	Joppa, MD	Harford County, Maryland	17,307
21087	Kingsville, MD	Baltimore County, Maryland	5,537
21090	Linthicum Heights, MD	Anne Arundel County, Maryland	10,652
21093	Lutherville Timonium, MD	Baltimore County, Maryland	39,100
21102	Manchester, MD	Carroll County, Maryland	12,162
21104	Marriottsville, MD	Howard County, Maryland	6,052
21108	Millersville, MD	Anne Arundel County, Maryland	18,643
21111	Monkton, MD	Baltimore County, Maryland	4,714
21113	Odenton, MD	Anne Arundel County, Maryland	36,705
21114	Crofton, MD	Anne Arundel County, Maryland	25,590
21117	Owings Mills, MD	Baltimore County, Maryland	62,816
21120	Parkton, MD	Baltimore County, Maryland	7,440
21122	Pasadena, MD	Anne Arundel County, Maryland	61,566
21128	Perry Hall, MD	Baltimore County, Maryland	15,501
21131	Phoenix, MD	Baltimore County, Maryland	7,141
21132	Pylesville, MD	Harford County, Maryland	3,160
21133	Randallstown, MD	Baltimore County, Maryland	31,398
21136	Reisterstown, MD	Baltimore County, Maryland	32,088
21140	Riva, MD	Anne Arundel County, Maryland	4,417
21144	Severn, MD	Anne Arundel County, Maryland	37,118
21146	Severna Park, MD	Anne Arundel County, Maryland	28,591
21152	Sparks Glencoe, MD	Baltimore County, Maryland	6,459
21154	Street, MD	Harford County, Maryland	6,544
21155	Upperco, MD	Baltimore County, Maryland	3,313
21157	Westminster, MD	Carroll County, Maryland	38,984
21158	Westminster, MD	Carroll County, Maryland	22,083
21160	Whiteford, MD	Harford County, Maryland	2,441
21161	White Hall, MD	Harford County, Maryland	5,221
21162	White Marsh, MD	Baltimore County, Maryland	4,639
21163	Woodstock, MD	Howard County, Maryland	7,539
21201	Baltimore, MD	Baltimore city, Maryland	18,307
21202	Baltimore, MD	Baltimore city, Maryland	20,683
21204	Towson, MD	Baltimore County, Maryland	19,845
21205	Baltimore, MD	Baltimore city, Maryland	13,013
21206	Baltimore, MD	Baltimore city, Maryland	48,902
21207	Gwynn Oak, MD	Baltimore city, Maryland	47,099
21208	Pikesville, MD	Baltimore County, Maryland	37,276
21209	Baltimore, MD	Baltimore city, Maryland	30,126
21210	Baltimore, MD	Baltimore city, Maryland	14,134
21211	Baltimore, MD	Baltimore city, Maryland	14,969
21212	Baltimore, MD	Baltimore city, Maryland	33,974
21213	Baltimore, MD	Baltimore city, Maryland	28,058
21214	Baltimore, MD	Baltimore city, Maryland	21,092
21215	Baltimore, MD	Baltimore city, Maryland	52,229
21216	Baltimore, MD	Baltimore city, Maryland	29,426
21217	Baltimore, MD	Baltimore city, Maryland	30,792
21218	Baltimore, MD	Baltimore city, Maryland	44,014
21219	Sparrows Point, MD	Baltimore County, Maryland	9,565
21220	Middle River, MD	Baltimore County, Maryland	42,824
21221	Essex, MD	Baltimore County, Maryland	43,487
21222	Dundalk, MD	Baltimore County, Maryland	59,407
21223	Baltimore, MD	Baltimore city, Maryland	19,572
21224	Baltimore, MD	Baltimore city, Maryland	47,465
21225	Brooklyn, MD	Anne Arundel County, Maryland	34,062
21226	Curtis Bay, MD	Anne Arundel County, Maryland	6,674
21227	Halethorpe, MD	Baltimore County, Maryland	34,907
21228	Catonsville, MD	Baltimore County, Maryland	50,492
21229	Baltimore, MD	Baltimore city, Maryland	46,679
21230	Baltimore, MD	Baltimore city, Maryland	32,977
21231	Baltimore, MD	Baltimore city, Maryland	14,969
21234	Parkville, MD	Baltimore County, Maryland	66,334
21236	Nottingham, MD	Baltimore County, Maryland	39,514
21237	Rosedale, MD	Baltimore County, Maryland	31,425
21239	Baltimore, MD	Baltimore city, Maryland	27,346
21244	Windsor Mill, MD	Baltimore County, Maryland	38,208
21252	Towson, MD	Baltimore County, Maryland	4,865
21286	Towson, MD	Baltimore County, Maryland	21,853
21401	Annapolis, MD	Anne Arundel County, Maryland	38,629
21402	Annapolis, MD	Anne Arundel County, Maryland	4,303
21403	Annapolis, MD	Anne Arundel County, Maryland	32,681
21409	Annapolis, MD	Anne Arundel County, Maryland	20,289
21502	Cumberland, MD	Allegany County, Maryland	41,015
21520	Accident, MD	Garrett County, Maryland	1,918
21521	Barton, MD	Allegany County, Maryland	1,400
21530	Flintstone, MD	Allegany County, Maryland	1,404
21531	Friendsville, MD	Garrett County, Maryland	2,487
21532	Frostburg, MD	Allegany County, Maryland	13,647
21536	Grantsville, MD	Garrett County, Maryland	3,833
21539	Lonaconing, MD	Allegany County, Maryland	1,975
21541	Mc Henry, MD	Garrett County, Maryland	1,335
21545	Mount Savage, MD	Allegany County, Maryland	1,694
21550	Oakland, MD	Garrett County, Maryland	13,691
21555	Oldtown, MD	Allegany County, Maryland	1,470
21557	Rawlings, MD	Allegany County, Maryland	1,481
21561	Swanton, MD	Garrett County, Maryland	2,412
21562	Westernport, MD	Allegany County, Maryland	3,032
21601	Easton, MD	Talbot County, Maryland	24,671
21613	Cambridge, MD	Dorchester County, Maryland	17,926
21617	Centreville, MD	Queen Anne's County, Maryland	10,428
21619	Chester, MD	Queen Anne's County, Maryland	6,152
21620	Chestertown, MD	Kent County, Maryland	13,810
21623	Church Hill, MD	Queen Anne's County, Maryland	2,669
21625	Cordova, MD	Talbot County, Maryland	1,766
21629	Denton, MD	Caroline County, Maryland	10,252
21631	East New Market, MD	Dorchester County, Maryland	2,429
21632	Federalsburg, MD	Caroline County, Maryland	6,436
21635	Galena, MD	Kent County, Maryland	2,085
21636	Goldsboro, MD	Caroline County, Maryland	1,097
21638	Grasonville, MD	Queen Anne's County, Maryland	5,420
21639	Greensboro, MD	Caroline County, Maryland	4,682
21640	Henderson, MD	Caroline County, Maryland	1,163
21643	Hurlock, MD	Dorchester County, Maryland	5,392
21649	Marydel, MD	Caroline County, Maryland	1,890
21651	Millington, MD	Kent County, Maryland	2,290
21654	Oxford, MD	Talbot County, Maryland	1,179
21655	Preston, MD	Caroline County, Maryland	5,053
21657	Queen Anne, MD	Queen Anne's County, Maryland	1,354
21658	Queenstown, MD	Queen Anne's County, Maryland	3,632
21659	Rhodesdale, MD	Dorchester County, Maryland	1,601
21660	Ridgely, MD	Caroline County, Maryland	4,132
21661	Rock Hall, MD	Kent County, Maryland	2,613
21663	Saint Michaels, MD	Talbot County, Maryland	3,764
21666	Stevensville, MD	Queen Anne's County, Maryland	14,394
21668	Sudlersville, MD	Queen Anne's County, Maryland	2,011
21673	Trappe, MD	Talbot County, Maryland	2,843
21678	Worton, MD	Kent County, Maryland	1,658
21701	Frederick, MD	Frederick County, Maryland	43,048
21702	Frederick, MD	Frederick County, Maryland	49,605
21703	Frederick, MD	Frederick County, Maryland	41,960
21704	Frederick, MD	Frederick County, Maryland	20,006
21710	Adamstown, MD	Frederick County, Maryland	4,661
21713	Boonsboro, MD	Washington County, Maryland	9,846
21716	Brunswick, MD	Frederick County, Maryland	7,200
21719	Cascade, MD	Washington County, Maryland	1,178
21722	Clear Spring, MD	Washington County, Maryland	6,721
21727	Emmitsburg, MD	Frederick County, Maryland	6,052
21733	Fairplay, MD	Washington County, Maryland	1,275
21734	Funkstown, MD	Washington County, Maryland	1,076
21737	Glenelg, MD	Howard County, Maryland	2,474
21738	Glenwood, MD	Howard County, Maryland	3,696
21740	Hagerstown, MD	Washington County, Maryland	64,792
21742	Hagerstown, MD	Washington County, Maryland	34,069
21750	Hancock, MD	Washington County, Maryland	3,417
21754	Ijamsville, MD	Frederick County, Maryland	8,156
21755	Jefferson, MD	Frederick County, Maryland	5,909
21756	Keedysville, MD	Washington County, Maryland	3,640
21757	Keymar, MD	Carroll County, Maryland	2,671
21758	Knoxville, MD	Frederick County, Maryland	4,409
21767	Maugansville, MD	Washington County, Maryland	1,031
21769	Middletown, MD	Frederick County, Maryland	11,965
21770	Monrovia, MD	Frederick County, Maryland	8,751
21771	Mount Airy, MD	Carroll County, Maryland	33,031
21773	Myersville, MD	Frederick County, Maryland	5,826
21774	New Market, MD	Frederick County, Maryland	17,134
21776	New Windsor, MD	Carroll County, Maryland	6,261
21777	Point Of Rocks, MD	Frederick County, Maryland	2,462
21779	Rohrersville, MD	Washington County, Maryland	1,311
21780	Sabillasville, MD	Frederick County, Maryland	2,159
21782	Sharpsburg, MD	Washington County, Maryland	3,704
21783	Smithsburg, MD	Washington County, Maryland	9,910
21784	Sykesville, MD	Carroll County, Maryland	39,258
21787	Taneytown, MD	Carroll County, Maryland	11,645
21788	Thurmont, MD	Frederick County, Maryland	11,654
21791	Union Bridge, MD	Frederick County, Maryland	5,340
21793	Walkersville, MD	Frederick County, Maryland	10,719
21794	West Friendship, MD	Howard County, Maryland	2,192
21795	Williamsport, MD	Washington County, Maryland	10,144
21797	Woodbine, MD	Howard County, Maryland	8,643
21798	Woodsboro, MD	Frederick County, Maryland	2,928
21801	Salisbury, MD	Wicomico County, Maryland	30,088
21804	Salisbury, MD	Wicomico County, Maryland	40,430
21811	Berlin, MD	Worcester County, Maryland	24,377
21813	Bishopville, MD	Worcester County, Maryland	2,999
21817	Crisfield, MD	Somerset County, Maryland	4,417
21822	Eden, MD	Wicomico County, Maryland	2,926
21826	Fruitland, MD	Wicomico County, Maryland	5,451
21830	Hebron, MD	Wicomico County, Maryland	5,200
21837	Mardela Springs, MD	Wicomico County, Maryland	2,891
21838	Marion Station, MD	Somerset County, Maryland	1,873
21842	Ocean City, MD	Worcester County, Maryland	11,226
21849	Parsonsburg, MD	Wicomico County, Maryland	3,388
21850	Pittsville, MD	Wicomico County, Maryland	3,850
21851	Pocomoke City, MD	Worcester County, Maryland	7,297
21853	Princess Anne, MD	Somerset County, Maryland	10,537
21856	Quantico, MD	Wicomico County, Maryland	1,037
21863	Snow Hill, MD	Worcester County, Maryland	5,281
21871	Westover, MD	Somerset County, Maryland	1,764
21874	Willards, MD	Wicomico County, Maryland	1,693
21875	Delmar, MD	Wicomico County, Maryland	7,646
21890	Westover, MD	Somerset County, Maryland	3,289
21901	North East, MD	Cecil County, Maryland	19,514
21903	Perryville, MD	Cecil County, Maryland	5,692
21904	Port Deposit, MD	Cecil County, Maryland	6,233
21911	Rising Sun, MD	Cecil County, Maryland	10,551
21912	Warwick, MD	Cecil County, Maryland	1,536
21915	Chesapeake City, MD	Cecil County, Maryland	2,471
21917	Colora, MD	Cecil County, Maryland	2,233
21918	Conowingo, MD	Cecil County, Maryland	4,169
21919	Earleville, MD	Cecil County, Maryland	3,626
21920	Elk Mills, MD	Cecil County, Maryland	1,413
21921	Elkton, MD	Cecil County, Maryland	45,527

02 — About this data

Census figures are published for ZIP Code Tabulation Areas, which approximate USPS ZIP Code delivery areas; values shown as — are not published or are suppressed by the source.

Use of this page

Area statistics only. These figures describe a ZIP Code area — not any person or household — and do not rate the area or the people who live there. CoverFi is not a consumer reporting agency; do not use this page to make decisions about credit, insurance, employment or housing.

Sources

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ZIP Code Tabulation Areas. Estimates are survey-based and have margins of error.
U.S. Census Bureau, ZIP Code Business Patterns 2023 (establishment counts by NAICS sector; employment and payroll totals).
Federal Housing Finance Agency, House Price Index for five-digit ZIP Codes, census tracts and counties — annual, developmental, not seasonally adjusted.
IRS Statistics of Income, Individual Income Tax ZIP Code Data, tax year 2022.
U.S. Census Bureau, 2024 Gazetteer Files (ZCTA locations, used for nearby ZIP Codes).
HUD USPS ZIP Code Crosswalk Files (ZIP-to-tract and ZIP-to-county assignment).

This product uses Census Bureau data but is not endorsed or certified by the Census Bureau. This product uses the HUD User Data API but is not endorsed or certified by HUD User. ZIP Code Tabulation Areas are Census approximations of USPS ZIP Code delivery areas and may not match them exactly. ZIP Code is a trademark of the United States Postal Service.