| Official Name: | Flagstaff County |
| Settlement Type: | Municipal district |
| Seal Type: | Logo |
| Image Map1: | AB locator FLAGSTAFF COUNTY.svg |
| Mapsize1: | 200 |
| Map Caption1: | Location within Alberta |
| Subdivision Type: | Country |
| Subdivision Name: | Canada |
| Subdivision Type1: | Province |
| Subdivision Name1: | Alberta |
| Subdivision Type2: | Region |
| Subdivision Name2: | Central Alberta |
| Subdivision Type3: | Planning region |
| Subdivision Name3: | North Saskatchewan |
| Leader Title: | Reeve |
| Leader Name: | Donald Kroetch |
| Leader Title1: | Governing body |
| Leader Name1: | Flagstaff County Council |
| Leader Title2: | Administrative office |
| Leader Name2: | Sedgewick |
| Established Title: | Established |
| Established Date: | 1944 |
| Established Title2: | Incorporated |
| Established Date2: | 1968 |
| Area Footnotes: | (2021) |
| Area Land Km2: | 3959.78 |
| Population As Of: | 2021 |
| Population Total: | 3694 |
| Population Density Km2: | 0.9 |
| Timezone: | MST |
| Utc Offset: | −7 |
| Timezone Dst: | MDT |
| Utc Offset Dst: | −6 |
| Coordinates: | 52.7725°N -111.6969°W |
Flagstaff County is a municipal district in east central Alberta, Canada.
It is located in Census Division 7. The county was incorporated in the current boundaries in 1944 as Municipal District of Killam No. 390, name changed a year later to Municipal District of Flagstaff No. 62. It was established as a county in 1968. Its municipal office is located in the Town of Sedgewick.
The following urban municipalities are surrounded by Flagstaff County.
The following hamlets are located within Flagstaff County.
The following localities are located within Flagstaff County.[3]
In the 2021 Census of Population conducted by Statistics Canada, Flagstaff County had a population of 3,694 living in 1,378 of its 1,558 total private dwellings, a change of from its 2016 population of 3,728. With a land area of, it had a population density of in 2021.[4]
In the 2016 Census of Population conducted by Statistics Canada, Flagstaff County had a population of 3,738 living in 1,380 of its 1,532 total private dwellings, a change from its 2011 population of 3,591. With a land area of 4067.58km2, it had a population density of in 2016.[5]