Feature Name | Class | Elev.
meters | County | Latitude
DMS | Longitude
DMS |
| Zekiah Valley | Populated Place | 54 | Charles | 38 34 14 N | 076 51 27 W |
| Zeman | Populated Place | 41 | Anne Arundel | 39 06 55 N | 076 36 23 W |
| Ziegler Estates | Populated Place | 142 | Frederick | 39 31 32 N | 077 25 44 W |
| Zihlman | Populated Place | 486 | Allegany | 39 40 05 N | 078 54 54 W |
| Zion | Populated Place | 118 | Cecil | 39 40 32 N | 075 57 54 W |
| Zion Acres | Populated Place | 113 | Cecil | 39 40 31 N | 075 58 07 W |
| Zipprian Estates | Populated Place | 234 | Carroll | 39 32 48 N | 076 54 49 W |
| Zittlestown | Populated Place | 304 | Washington | 39 29 07 N | 077 37 26 W |
| Abell Post Office | Post Office | 3 | St. Mary's | 38 15 17 N | 076 44 38 W |
| Aberdeen Post Office | Post Office | 31 | Harford | 39 30 34 N | 076 09 55 W |
| Aberdeen Proving Ground Post Office | Post Office | 13 | Harford | 39 28 56 N | 076 07 49 W |
| Abingdon Post Office | Post Office | 71 | Harford | 39 28 40 N | 076 18 35 W |
| Accokeek Post Office | Post Office | 58 | Prince George's | 38 39 54 N | 077 01 60 W |
| Adamstown Post Office | Post Office | 92 | Frederick | 39 18 40 N | 077 28 31 W |
| Allen Post Office | Post Office | 7 | Wicomico | 38 17 30 N | 075 41 25 W |
| American Cities Post Office | Post Office | 104 | Howard | 39 12 54 N | 076 51 23 W |
| Annapolis Junction Post Office | Post Office | 61 | Howard | 39 07 43 N | 076 47 29 W |
| Annapolis Post Office | Post Office | 12 | Anne Arundel | 38 58 44 N | 076 29 36 W |
| Aquasco Post Office | Post Office | 49 | Prince George's | 38 34 51 N | 076 43 28 W |
| Arlington Station Baltimore Post Office | Post Office | 122 | Baltimore (city) | 39 20 02 N | 076 40 26 W |
| Arnold Post Office | Post Office | 36 | Anne Arundel | 39 01 36 N | 076 30 04 W |
| Arundel on the Bay Post Office (historical) | Post Office | 5 | Anne Arundel | 38 55 15 N | 076 27 49 W |
| Ashton Post Office | Post Office | 149 | Montgomery | 39 08 50 N | 077 00 39 W |
| Aspen Post Office | Post Office | 118 | Montgomery | 39 05 10 N | 077 04 29 W |
| Avenue Post Office | Post Office | 5 | St. Mary's | 38 15 35 N | 076 45 60 W |
| Baldwin Post Office | Post Office | 112 | Baltimore | 39 29 40 N | 076 28 16 W |
| Baltimore Post Office | Post Office | 6 | Baltimore (city) | 39 17 32 N | 076 36 20 W |
| Barclay Post Office | Post Office | 21 | Queen Anne's | 39 08 39 N | 075 51 50 W |
| Barstow Post Office | Post Office | 49 | Calvert | 38 31 40 N | 076 36 52 W |
| Barton Post Office | Post Office | 392 | Allegany | 39 32 02 N | 079 01 00 W |
| Bay Ridge Post Office (historical) | Post Office | 9 | Anne Arundel | 38 56 16 N | 076 27 36 W |
| Bay View Post Office (historical) | Post Office | 116 | Cecil | 39 38 38 N | 075 57 41 W |
| Beallsville Post Office | Post Office | 158 | Montgomery | 39 10 45 N | 077 24 48 W |
| Beauvue Post Office (historical) | Post Office | 14 | St. Mary's | 38 15 16 N | 076 37 40 W |
| Bel Air Post Office | Post Office | 122 | Harford | 39 32 19 N | 076 21 09 W |
| Bel Alton Post Office | Post Office | 53 | Charles | 38 27 47 N | 076 59 10 W |
| Belcamp Post Office | Post Office | 6 | Harford | 39 28 06 N | 076 14 19 W |
| Bellevue Post Office (historical) | Post Office | 3 | Talbot | 38 42 13 N | 076 11 04 W |
| Beltsville Post Office | Post Office | 40 | Prince George's | 39 02 23 N | 076 54 34 W |
| Benedict Post Office | Post Office | 0 | Charles | 38 30 42 N | 076 40 41 W |
| Benson Post Office | Post Office | 132 | Harford | 39 30 15 N | 076 23 06 W |
| Berlin Post Office | Post Office | 13 | Worcester | 38 19 24 N | 075 13 09 W |
| Bethesda Annex Post Office | Post Office | 7 | Montgomery | 38 54 46 N | 077 05 54 W |
| Bethesda Post Office | Post Office | 107 | Montgomery | 38 59 03 N | 077 05 37 W |
| Bethlehem Post Office | Post Office | 14 | Caroline | 38 44 45 N | 075 56 39 W |
| Betterton Post Office | Post Office | 20 | Kent | 39 22 05 N | 076 03 42 W |
| Big Pool Post Office | Post Office | 131 | Washington | 39 37 27 N | 078 01 00 W |
| Billingsley Post Office (historical) | Post Office | 61 | Charles | 38 36 17 N | 076 58 35 W |
| Bishops Head Post Office | Post Office | 0 | Dorchester | 38 16 12 N | 076 03 30 W |
| Bishopville Post Office | Post Office | 5 | Worcester | 38 26 36 N | 075 11 37 W |
| Bittinger Post Office | Post Office | 820 | Garrett | 39 36 09 N | 079 13 25 W |
| Bivalve Post Office | Post Office | 5 | Wicomico | 38 18 22 N | 075 53 23 W |
| Blair Post Office | Post Office | 101 | Montgomery | 38 59 16 N | 077 01 47 W |
| Bloomington Post Office | Post Office | 317 | Garrett | 39 28 43 N | 079 04 15 W |
| Blueball Post Office (historical) | Post Office | 115 | Cecil | 39 42 02 N | 075 55 56 W |
| Bohemia Mills Post Office (historical) | Post Office | 13 | Cecil | 39 27 52 N | 075 46 29 W |
| Boonsboro Post Office | Post Office | 163 | Washington | 39 30 23 N | 077 39 11 W |
| Boring Post Office | Post Office | 215 | Baltimore | 39 31 52 N | 076 49 21 W |
| Boyds Post Office | Post Office | 126 | Montgomery | 39 11 07 N | 077 18 58 W |
| Bozman Post Office | Post Office | 3 | Talbot | 38 46 14 N | 076 16 14 W |
| Braddock Heights Post Office | Post Office | 278 | Frederick | 39 25 07 N | 077 30 13 W |
| Bradshaw Post Office | Post Office | 18 | Baltimore | 39 25 17 N | 076 22 46 W |
| Brandywine Post Office | Post Office | 67 | Prince George's | 38 41 51 N | 076 51 08 W |
| Brinklow Post Office | Post Office | 135 | Montgomery | 39 10 02 N | 077 00 59 W |
| Brookeville Post Office | Post Office | 131 | Montgomery | 39 10 50 N | 077 03 30 W |
| Brooklandville Post Office | Post Office | 91 | Baltimore | 39 25 07 N | 076 40 07 W |
| Broomes Island Post Office | Post Office | 4 | Calvert | 38 25 19 N | 076 32 46 W |
| Brownsville Post Office | Post Office | 164 | Washington | 39 22 55 N | 077 39 38 W |
| Brunswick Post Office | Post Office | 97 | Frederick | 39 18 53 N | 077 37 54 W |
| Bryans Road Post Office | Post Office | 54 | Charles | 38 37 38 N | 077 04 24 W |
| Bryantown Post Office | Post Office | 35 | Charles | 38 33 20 N | 076 50 41 W |
| Buckeystown Post Office | Post Office | 72 | Frederick | 39 19 57 N | 077 25 55 W |
| Buenavista Post Office (historical) | Post Office | 6 | Calvert | 38 31 40 N | 076 39 06 W |
| Burkittsville Post Office | Post Office | 178 | Frederick | 39 23 36 N | 077 37 45 W |
| Burtonsville Post Office | Post Office | 147 | Montgomery | 39 06 25 N | 076 56 19 W |
| Bushwood Post Office | Post Office | 36 | St. Mary's | 38 17 48 N | 076 46 46 W |
| Butler Post Office | Post Office | 105 | Baltimore | 39 32 07 N | 076 43 39 W |
| Cabin John Post Office | Post Office | 48 | Montgomery | 38 58 29 N | 077 09 43 W |
| California Post Office | Post Office | 35 | St. Mary's | 38 17 37 N | 076 29 53 W |
| Callaway Post Office | Post Office | 31 | St. Mary's | 38 13 28 N | 076 31 07 W |
| Calvery Post Office (historical) | Post Office | 133 | Cecil | 39 41 57 N | 075 59 04 W |
| Cambridge Post Office | Post Office | 5 | Dorchester | 38 34 19 N | 076 04 37 W |
| Cardiff Post Office | Post Office | 138 | Harford | 39 43 05 N | 076 20 17 W |
| Carroll Station Baltimore Post Office | Post Office | 61 | Baltimore (city) | 39 16 53 N | 076 40 57 W |
| Cascade Post Office | Post Office | 418 | Washington | 39 42 31 N | 077 29 23 W |
| Catonsville Post Office | Post Office | 154 | Baltimore | 39 16 13 N | 076 44 14 W |
| Cavetown Post Office | Post Office | 224 | Washington | 39 38 38 N | 077 35 08 W |
| Cecilton Post Office | Post Office | 21 | Cecil | 39 24 16 N | 075 52 10 W |
| Centreville Post Office | Post Office | 19 | Queen Anne's | 39 02 36 N | 076 03 51 W |
| Chaptico Post Office | Post Office | 5 | St. Mary's | 38 22 05 N | 076 46 58 W |
| Charlestown Post Office | Post Office | 6 | Cecil | 39 34 24 N | 075 58 35 W |
| Charlotte Hall Post Office | Post Office | 49 | St. Mary's | 38 29 18 N | 076 46 24 W |
| Chase Post Office | Post Office | 6 | Baltimore | 39 21 38 N | 076 22 08 W |
| Chattolanee Post Office (historical) | Post Office | 122 | Baltimore | 39 24 30 N | 076 44 34 W |
| Cheltenham Post Office | Post Office | 73 | Prince George's | 38 44 08 N | 076 49 34 W |
| Cherryhill Post Office (historical) | Post Office | 66 | Cecil | 39 39 47 N | 075 51 13 W |
| Chesapeake Beach Post Office | Post Office | 12 | Calvert | 38 41 19 N | 076 32 06 W |
| Chesapeake City Post Office | Post Office | 17 | Cecil | 39 31 13 N | 075 49 11 W |
| Chester Post Office | Post Office | 2 | Queen Anne's | 38 58 30 N | 076 17 06 W |
| Chestertown Post Office | Post Office | 6 | Kent | 39 12 37 N | 076 04 02 W |
| Chesterville Post Office (historical) | Post Office | 17 | Kent | 39 16 34 N | 075 54 57 W |
| Chevy Chase Post Office | Post Office | 107 | Montgomery | 38 58 14 N | 077 04 39 W |
| Chewsville Post Office | Post Office | 193 | Washington | 39 38 35 N | 077 38 07 W |
| Childs Post Office | Post Office | 44 | Cecil | 39 38 46 N | 075 52 21 W |
| Church Creek Post Office | Post Office | 0 | Dorchester | 38 30 07 N | 076 09 08 W |
| Church Hill Post Office (historical) | Post Office | 13 | Queen Anne's | 39 08 32 N | 075 59 08 W |
| Churchton Post Office | Post Office | 2 | Anne Arundel | 38 48 07 N | 076 32 09 W |
| Churchville Post Office | Post Office | 129 | Harford | 39 33 32 N | 076 15 03 W |
| Claiborne Post Office | Post Office | 3 | Talbot | 38 50 12 N | 076 16 31 W |
| Clarksburg Post Office | Post Office | 198 | Montgomery | 39 14 19 N | 077 16 43 W |
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