Maryland Counties, Demographics & Geography
Complete official guide to all 24 counties in Maryland (MD). Explore 2024 US Census population estimates, county seats, FIPS codes, land areas, and interactive mapping tools powered by GeoMap Suite.
Maryland County Breakdown
Showing 8 of 8 documented counties and seats.
County Name | FIPS | County Seat | Population (Census) | Land Area | Quick Tool |
|---|---|---|---|---|---|
| Montgomery County | 24031 | Rockville | 1,062,061 | 491 sq mi | Lookup |
| Prince George’s County | 24033 | Upper Marlboro | 967,201 | 483 sq mi | Lookup |
| Baltimore County | 24005 | Towson | 854,535 | 598 sq mi | Lookup |
| Anne Arundel County | 24003 | Annapolis | 588,261 | 415 sq mi | Lookup |
| Baltimore City (Independent) | 24510 | Baltimore | 585,708 | 81 sq mi | Lookup |
| Howard County | 24027 | Ellicott City | 332,317 | 251 sq mi | Lookup |
| Frederick County | 24021 | Frederick | 271,705 | 660 sq mi | Lookup |
| Harford County | 24025 | Bel Air | 260,924 | 437 sq mi | Lookup |
Geographic Structure of Maryland Counties
County Administration & Governance
In Maryland, county governments manage vital public infrastructure, tax assessments, law enforcement, judicial courts, election administration, and public records. The county seat (Rockville and other municipal headquarters) houses the primary courthouse, commissioners, and sheriff’s department.
All Maryland counties carry a unique 5-digit Federal Information Processing Standard (FIPS) code, where the first two digits (24) designate the state and the remaining three digits identify each specific jurisdiction.
Geographic & Demographic Highlights
- Most Populous County:Montgomery County (1,062,061 residents)
- Largest by Land Area:Frederick County (660 sq mi)
- State Capital:Annapolis
- Census Bureau Region:South United States
Demographic calculations derive from the United States Census Bureau 2024 Population Estimates Program (PEP) and TIGER/Line geographic boundary files.