Arnold is a community in Anne Arundel County, Maryland, home to about 24,303 people across 11 square miles. Its ZIP code is 21012, and parts of 21409 are in Arnold too.
Homes sold for a median of $270 per square foot in the three months ending August 2026, a seller’s market.
All in Arnold
Mostly Cape St. Claire; part is in Arnold
Each card is that ZIP code’s whole market, including any part outside Arnold. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Arnold’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Baltimore/Washington International Thurgood Marshall Airport (BWI)13 miles away |
|---|---|
| Nearest city of 250,000+ | Baltimore, MD19 miles away |
| Nearest city of 1 million+ | Philadelphia, PA98 miles away |
Straight-line distances from the center of Arnold; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Arnold had 24,064 residents in the 2020 census, up 3% since 2000.
It’s the 60th largest of 527 towns in Maryland by population.
Anne Arundel County grew from 39,620 residents in 1900 to 588,261 in 2020.
Anne Arundel County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 86°F in summer, and winter lows average 30°F. About 43.9 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Annapolis Naf, MD weather station (5 miles away).
245,664 jobs at 14,718 businesses in Anne Arundel County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
212 doctors and other health care providers list an office in Arnold.
Nearest hospitals
Providers with an office here
| Primary care doctors | 23 |
|---|---|
| Specialist doctors | 17 |
| Dentists | 16 |
| Nurse practitioners and physician assistants | 38 |
| Mental health providers | 84 |
| Physical and occupational therapists | 26 |
| Optometrists | 3 |
| Chiropractors | 5 |
| Pharmacies | 8 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (10 nearby)
Grocery stores (2 nearby)
Pharmacies (3 nearby)
Libraries (2 nearby)
Museums
Theaters and performance venues
Counts are within about 2.5 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Anne Arundel County Public Schools. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Belvedere ElementaryArnold | Pre-K–5 | 542 | Public | 1.1 mi |
| Arnold ElementaryArnold | K–5 | 454 | Public | 1.2 mi |
| Broadneck ElementaryArnold | K–5 | 652 | Public | 0.3 mi |
| AACPS Virtual AcademyArnold | 3–12 | 384 | Alternative Education | 1.5 mi |
| Magothy River MiddleArnold | 6–8 | 655 | Public | 1.5 mi |
| Severn River MiddleArnold | 6–8 | 675 | Public | 1.5 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| Arnold Christian AcademyArnold | K–8 | 80 | Calvinist | 0.7 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools; Private School Universe Survey (2023-2024) for private schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Cape St. Claire.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.