| Official Name: | County of Paintearth No. 18 |
| Settlement Type: | Municipal district |
| Image Map1: | AB locator COUNTY OF PAINTEARTH NO 18.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: | Red Deer |
| Government Footnotes: | [1] |
| Leader Title: | Reeve |
| Leader Title1: | Governing body |
| Leader Name1: | County of Paintearth Council |
| Leader Title2: | Administrative office |
| Leader Name2: | southeast of Castor |
| Established Title: | Established |
| Established Date: | 1944 |
| Established Title2: | Incorporated |
| Established Date2: | 1962 |
| Area Footnotes: | (2021) |
| Area Land Km2: | 3239.58 |
| Population As Of: | 2021 |
| Population Total: | 1990 |
| Population Density Km2: | 0.6 |
| Timezone: | MST |
| Utc Offset: | −07:00 |
| Timezone Dst: | MDT |
| Utc Offset Dst: | −06:00 |
The County of Paintearth No. 18 is a municipal district in east central Alberta, Canada. Located in Census Division No. 7, its municipal office is located southeast of the Town of Castor near the intersection of Highway 12 and Highway 36.
Originally incorporated in 1944 as the Municipal District of Paintearth No. 334, it was established as a county in 1962.
In the 2021 Census of Population conducted by Statistics Canada, the County of Paintearth No. 18 had a population of 1,990 living in 648 of its 720 total private dwellings, a change of from its 2016 population of 2,102. 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 Paintearth No. 18 had a population of 2,102 living in 638 of its 696 total private dwellings, a change from its 2011 population of 2,029. With a land area of 3283.36km2, it had a population density of in 2016.[3]
The following urban municipalities are surrounded by the County of Paintearth No. 18.
The following hamlets are located within the County of Paintearth No. 18.
The following localities are located within the County of Paintearth No. 18.[4]