| Dewar, Iowa | |
| Settlement Type: | Unincorporated town |
| Pushpin Map: | USA Iowa#USA |
| Pushpin Map Caption: | Location within the state of Iowa |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Iowa |
| Subdivision Type2: | County |
| Subdivision Name2: | Black Hawk |
| Unit Pref: | Imperial |
| Population As Of: | 2000 |
| Population Density Km2: | auto |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 889 |
| Coordinates: | 42.5256°N -92.2192°W |
| Postal Code Type: | ZIP codes |
| Postal Code: | 50623 |
| Area Code: | 319 |
| Blank Name: | FIPS code |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 455900 |
Dewar is an unincorporated town in eastern Black Hawk County, Iowa, United States. It lies northeast of the city of Waterloo, the county seat of Black Hawk County.[1] Its elevation is 889 feet (271 m). Although Dewar is unincorporated, it has a post office with the ZIP code of 50623,[2] which opened on 25 October 1887.
Dewar (formerly known as Emert) was platted in 1888.[3] Dewar's population was 22 in 1902,[4] and 40 in 1925.[5] The population was 84 in 1940.[6]