Bridgewater is a city in Jackson Township, Adair County, Iowa, United States.

Bridgewater got its start in 1885 when the Chicago, Burlington and Quincy Railroad was extended to that point.

According to the United States Census Bureau, the city has a total area of 0.29 square miles (0.75 km2), all land.

There were 89 housing units at an average density of 308.7 per square mile (119.2/km2).

There were 100 housing units at an average density of 344.8 per square mile (133.1/km2).

43.8% of all households were made up of individuals, and 28.1% had someone living alone who was 65 years of age or older.

There were 105 housing units at an average density of 366.1 per square mile (141.4/km2).

32.2% of all households were made up of individuals, and 17.2% had someone living alone who was 65 years of age or older.

None of the families and 7.0% of the population were living below the poverty line, including no under eighteens and 6.6% of those over 64.