63303 is zip code located in St. Charles, Missouri. The population is 45,781, making 63303 the 2nd largest zipcode in St. Charles and the 4th largest in St. Charles County.
There are 0 public schools in 63303 with an average Homefacts rating of A. , and there are 51 registered sex offenders residing in the zip code 63303. Unemployment in 63303 is low.
Zip codes within St. Charles include 63045, 63301 and 63302.