| Official Name: | County of Forty Mile No. 8 |
| Settlement Type: | Municipal district |
| Seal Type: | Seal |
| Image Blank Emblem: | Forty Mile County AB welcome sign.jpg |
| Blank Emblem Type: | Welcome sign |
| Image Map1: | AB locator COUNTY OF FORTY MILE NO 8.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: | Southern Alberta |
| Subdivision Type3: | Planning region |
| Subdivision Name3: | South Saskatchewan |
| Leader Title: | Reeve |
| Leader Name: | Steven Wikkerink |
| Leader Title1: | Governing body |
| Leader Name1: | County of Forty Mile Council |
| Leader Title2: | Administrative office |
| Leader Name2: | Foremost |
| Established Title: | Established |
| Established Date: | 1954 |
| Established Title2: | Incorporated |
| Established Date2: | 1958 |
| Area Footnotes: | (2021) |
| Area Land Km2: | 7163.61 |
| Population As Of: | 2021 |
| Population Total: | 3471 |
| Population Density Km2: | 0.5 |
| Timezone: | MST |
| Utc Offset: | −7 |
| Timezone Dst: | MDT |
| Utc Offset Dst: | −6 |
The County of Forty Mile No. 8 is a municipal district in south eastern Alberta, Canada. It is located in Census Division 1, southwest of Medicine Hat. Its municipal office is located in the Village of Foremost.The County of Forty Mile is filled with several ghost towns such as Nemiskam, Orion, Conquerville, Altorado, Conrad, and the partially abandoned Etzikom.
The following urban municipalities are surrounded by the County of Forty Mile No. 8.
The following hamlets are located within the County of Forty Mile No. 8.
The following localities are located within the County of Forty Mile No. 8.[1]
In the 2021 Census of Population conducted by Statistics Canada, the County of Forty Mile No. 8 had a population of 3,471 living in 861 of its 994 total private dwellings, a change of from its 2016 population of 3,581. With a land area of, it had a population density of in 2021.[2]
In the 2016 Census of Population conducted by Statistics Canada, the County of Forty Mile No. 8 had a population of 3,581 living in 865 of its 968 total private dwellings, a change from its 2011 population of 3,336. With a land area of 7249.31km2, it had a population density of in 2016.[3]