45040 is zip code located in Mason, Ohio. The population is 50,859, making 45040 the largest zipcode in Mason and the largest in Warren County.
There are 6 public schools in 45040 with an average Homefacts rating of A. The total crime rate for Mason is very low , and there are 10 registered sex offenders residing in the zip code 45040. Unemployment in 45040 is moderate.