Anne Arundel County vs Baltimore County
Two neighbouring counties in Maryland, compared on population, size, income and housing. They share 16 mi of border.
Anne Arundel County
Maryland
Baltimore County
Maryland
Both outlines are drawn at true relative size. Baltimore County spans about 58.0 km at its widest.
Side by side
| Measure | Anne Arundel County | Difference | Baltimore County |
|---|---|---|---|
| Population | 603,380 | -28.8% | 847,650 |
| Change since 2020 | 1.7% | +2.4 pp | -0.7% |
| Land area | 414.8 sq mi | -30.7% | 598.4 sq mi |
| Population density | 1,455 per sq mi | +2.7% | 1,417 per sq mi |
| Median household income | $124,911 | +36.1% | $91,768 |
| Median home value | $467,900 | +34.0% | $349,300 |
| Median age | 39.0 | -1.8% | 39.7 |
| Households | 224,748 | -32.5% | 332,801 |
| Housing units | 236,262 | -32.7% | 350,821 |
Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026; US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. The difference column is computed here: the first county's figure against the second, expressed as a percentage of the second. The change-since-2020 row is the exception: two growth rates differ in percentage points (pp), not percent. Retrieved 30 August 2026.
What the numbers say
- Baltimore County holds about 1.4 times the population of Anne Arundel County: 847,650 against 603,380.
- Baltimore County covers more ground, at 598.4 square miles against 414.8.
- Anne Arundel County is the more crowded of the two, at 1,455 people per square mile against 1,417.
- Median household income is higher in Anne Arundel County, by 33,143 dollars a year.
- Since 2020, Anne Arundel County has grown by 1.7% and Baltimore County has shrunk by 0.7%.
- They share 16 mi of common border, which the Census Bureau publishes in its county adjacency file and which almost no other county reference presents.
Full pages
Want a different pair? Compare any two of the 3,144 US counties.
Rebuilt from source data 30 August 2026. How these figures are produced.