Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — RANKINGS/MD/HIGHEST-AVERAGE-INCOME

ZIP Codes With the Highest Average Income in Maryland

What this measures. Total adjusted gross income divided by the number of tax returns filed. This is income per RETURN, not per person or per household — a return can be a single filer or a married couple. Source: IRS Statistics of Income, ZIP code data, data release 2026-10-12.

# ZIP City County Average AGI per return
1 20815 Chevy Chase Montgomery $384,462
2 20816 Bethesda Montgomery $341,637
3 20854 Potomac Montgomery $341,112
4 20817 Bethesda Montgomery $336,658
5 21654 Oxford Talbot $293,086
6 20818 Cabin John Montgomery $291,894
7 21738 Glenwood Howard $277,483
8 20759 Fulton Howard $267,256
9 21794 West Friendship Howard $258,252
10 20868 Spencerville Montgomery $253,520
11 21723 Cooksville Howard $249,795
12 21029 Clarksville Howard $242,414
13 20814 Bethesda Montgomery $239,647
14 20777 Highland Howard $237,615
15 21111 Monkton Baltimore $237,237
16 21131 Phoenix Baltimore $236,672
17 21663 Saint Michaels Talbot $231,948
18 21737 Glenelg Howard $227,697
19 21035 Davidsonville Anne Arundel $212,153
20 21036 Dayton Howard $208,447
21 21210 Baltimore Baltimore city $206,705
22 20862 Brinklow Montgomery $197,877
23 20860 Sandy Spring Montgomery $190,000
24 21204 Towson Baltimore $189,103
25 21662 Royal Oak Talbot $186,094
26 20895 Kensington Montgomery $182,883
27 21104 Marriottsville Howard $180,880
28 21042 Ellicott City Howard $179,052
29 21032 Crownsville Anne Arundel $178,009
30 20842 Dickerson Montgomery $177,734
31 20861 Ashton Montgomery $173,899
32 21146 Severna Park Anne Arundel $171,562
33 21152 Sparks Glencoe Baltimore $171,522
34 20833 Brookeville Montgomery $170,293
35 20882 Gaithersburg Montgomery $170,284
36 20630 Drayden St. Mary's $168,783
37 21093 Lutherville Timonium Baltimore $167,877
38 21409 Annapolis Anne Arundel $166,614
39 21612 Bozman Talbot $164,479
40 21030 Cockeysville Baltimore $162,329
41 21013 Baldwin Baltimore $162,028
42 21797 Woodbine Howard $159,916
43 21754 Ijamsville Frederick $159,216
44 21209 Baltimore Baltimore $155,914
45 21658 Queenstown Queen Anne's $153,492
46 21082 Hydes Baltimore $152,335
47 20778 West River Anne Arundel $146,949
48 21120 Parkton Baltimore $145,499
49 20841 Boyds Montgomery $143,446
50 21037 Edgewater Anne Arundel $142,832

Showing the top 50 of 385 ZIP codes in Maryland that have this figure and meet the threshold above. 20815 ranks 1st at $384,462, against $142,832 in 50th place.

Other rankings for Maryland

Cite this page

zipcodes.pro. “ZIP Codes With the Highest Average Income in Maryland.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/rankings/md/highest-average-income

Underlying data is public domain or openly licensed — sources, vintages and licences.