COUNTY · VA
Montgomery County, Virginia
Montgomery County is a county in Virginia with FIPS code 51121 and an estimated population of 98,666 (Census 2023), 19th largest of 133 in the state.
County facts
- Name
- Montgomery County
- State
- Virginia
- Type
- county
- FIPS code
- 51121
- State FIPS
- 51
- Population (2023)
- 98,666
- Change since 2020
- -0.9%
- State rank
- 19 of 133
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Montgomery County?
Montgomery County, Virginia has the five-digit FIPS code 51121: 51 for the state and 121 for the county.
What state is Montgomery County in?
Montgomery County is in Virginia.
How do I know if an address is in this county?
Use the address lookup. ZIP codes and city names can cross county lines, so an address is the reliable check.
Sources: U.S. Census Bureau geographic reference files; Census Bureau Population Estimates, Vintage 2023. Last reviewed 2026-10-27.