52321 is zip code located in Onslow, Iowa. The population is 531, making 52321 the largest zipcode in Onslow and the 7th largest in Jones County.
There are 0 public schools in 52321 with an average Homefacts rating of NA. , and there are 2 registered sex offenders residing in the zip code 52321. Unemployment in 52321 is low.