21401 ZIP Code, Annapolis, MD

21401 is a ZIP code in Annapolis, Maryland in Anne Arundel County. It covers 20 square miles of land. The closest ZIP codes are 21405, 21140 and 21032. 38,629 people live here in 17,984 households. At about 1,938 people per square mile it has suburban density, and owners and renters are mixed (65% own). Median household income is $123,381, above the Maryland median of $103,678; the median age is 47.7, older than most ZIP codes.

Quick facts

Key figures

MeasureValue
Residents38,629
Households17,984
Median household income$123,381
Income per person$80,697
Median age47.7
Homeowners65.4%
Median home value$601,400
Median rent$2,150
Bachelor's degree or higher61.1%
Average commute (minutes)28.4
Households with kids under 1818.3%
Moved in the past year13.9%
Below the poverty line7.1%
Broadband internet92.3%
Speak a non-English language at home13.1%

Household income

% of householdsValue
<$10K4.2%
$10–15K1.8%
$15–25K4.5%
$25–35K1.9%
$35–50K5.0%
$50–75K10.4%
$75–100K12.4%
$100–150K17.9%
$150–200K16.4%
$200K+25.4%

Age

% of all residentsValue
<108.6%
10–1910.1%
20–245.0%
25–3413.1%
35–4410.6%
45–5410.4%
55–6414.4%
65–7413.9%
75+14.2%

Tenure

% of housing unitsValue
Owned, with mortgage38.9%
Owned outright21.6%
Rented31.5%
Vacant8.0%

Type of building

% of housing unitsValue
Detached house43.5%
Townhome23.8%
2–4 units3.0%
5–19 units12.0%
20+ units17.4%
Mobile / other0.2%

Businesses in 21401

2,837 business establishments with 44,530 employees (ZIP Codes Business Patterns 2023).

EDDM carrier routes

21401 has 42 USPS carrier routes with 19,296 residential and 3,235 business mailboxes. Open the EDDM route map.

Carrier routes in 21401

21401 has 42 USPS carrier routes (37 city (C), 5 rural (R)) with 19,296 residential and 3,235 business mailboxes. Routes range from 37 homes (C020) to 968 homes (C011); the median route has 440 homes. The Census counted 17,984 households in 21401 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per routeRoutes
1–2492
250–49923
500–74913
750–9994
1,000–1,4990
1,500+0

Best routes in 21401 for…

Most businesses

For B2B offers: office supplies, cleaning, IT, catering and commercial services.

  1. Route C020 — USPS business mailboxes 473, 37 homes
  2. Route C043 — USPS business mailboxes 293, 348 homes
  3. Route C012 — USPS business mailboxes 243, 265 homes
  4. Route C011 — USPS business mailboxes 206, 968 homes
  5. Route C048 — USPS business mailboxes 174, 252 homes

Select these 5 routes on the route map

Every carrier route in 21401

RouteTypeHomesBusinessesEst. median incomeEst. ownersEst. families with kidsEst. moved in past year
C001City37764$162,028———
C003City506154$136,415———
C004City3800$115,833———
C005City3101$136,415———
C006City194135$187,055———
C007City275169$103,466———
C008City32842$200,001+———
C009City32861$158,816———
C010City2902$174,155———
C011City968206$103,466———
C012City265243$162,028———
C013City3416$94,900———
C014City8952$73,578———
C016City40658$187,055———
C018City5011$96,426———
C019City43666$75,000———
C020City37473$110,618———
C021City513141$187,055———
C022City57274$94,900———
C023City4672$110,618———
C027City44426$96,426———
C028City3553$158,816———
C029City507167$110,618———
C030City5975$150,389———
C031City4243$93,410———
C035City62782$172,659———
C036City56418$93,410———
C037City55916$200,001+———
C039City72758$100,000———
C041City596103$110,618———
C043City348293$157,197———
C044City355128$175,301———
C045City38233$158,816———
C046City7728$130,501———
C048City252174$110,618———
C050City28661$162,028———
C051City7634$128,493———
R001Rural5642$200,001+———
R011Rural46219$157,197———
R014Rural47958$120,663———
R023Rural59039$120,663———
R026Rural25435$120,663———

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 21401 on the EDDM route map.

How route demographics are estimated

Mailbox counts come from USPS; demographics are estimates

The number of homes and businesses on each carrier route is the current USPS EDDM count. The Census Bureau does not publish figures for carrier routes, so income, homeownership, ages, families, movers and housing age on a route are EDDM2GO estimates built from Census block groups (neighborhood areas of roughly 600 to 3,000 people).

How a route gets its figures: the block-group length-share method

We trace each route's streets every 25 meters and record which block group each stretch falls in. The route's homes are spread along its streets in proportion to length, so a route with 60% of its street length in one block group is assumed to have 60% of its homes there. Each block group then contributes its Census counts in proportion to the share of its housing units that sit on the route (capped at the whole block group). Medians are recalculated from the combined income, home-value and age brackets, the way the Census Bureau computes them, not averaged.

Margins of error

Census survey figures carry a margin of error at 90% confidence; we carry it through the calculation and show it as ±. Our margins treat the route-to-block-group split as exact, so the real uncertainty is larger. Routes with fewer than 100 estimated households, large margins, or streets we could not place are flagged.

Different years

USPS mailbox counts are current. Census figures are 5-year averages for 2020–2024, so a new subdivision may have more homes on the route today than the Census counted. Use the route figures to compare routes with each other, not as an exact head count.

Why some routes show identical figures

Two routes that run through the same block group get the same percentages and medians, because the Census publishes one set of figures for the whole block group. Their mailbox counts still differ, and those are exact.

Route and mailbox counts: USPS EDDM route data. Route demographics: EDDM2GO estimates from U.S. Census Bureau American Community Survey 5-year block-group data (2020–2024) and 2024 cartographic block-group boundaries. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.

Nearby ZIP codes

Areas that include 21401

Where it ranks

Mail every home in 21401

Route counts on this page price as Full Service 6.5 × 9 postcards: we print, bundle by carrier route and hand the mailing to USPS. Prefer to take it to the Post Office yourself? Print only costs less and you pay postage at drop-off.

EDDM guides

ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 21401, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 21401 in?
21401 is a Annapolis, MD mailing address. By land area, 49% lies inside Parole, 19% lies inside Annapolis, 4% lies inside Crownsville and 2% lies inside Annapolis Neck; the rest is outside any Census-defined city or community.
What county is 21401 in?
21401 is in Anne Arundel County.
What is the population of 21401?
About 38,629 people (±1,802), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 39,308.
What is the median household income in 21401?
$123,381 (±$6,698), compared with $103,678 for Maryland as a whole. Half the households in the ZIP code earn more and half earn less.
How many carrier routes and mailboxes are in 21401?
42 USPS carrier routes with 19,296 residential and 3,235 business mailboxes (22,532 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 21401?
The closest, measured center to center: 21405 (2.8 mi), 21140 (3.1 mi, Riva), 21032 (3.9 mi, Crownsville), 21402 (4.4 mi, Naval Academy), 21403 (4.6 mi, Annapolis Neck) and 21037 (4.8 mi, Mayo).

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.