Cook County Information:
# Cities: 61
# ZIP Codes: 164
# Area Codes: 6
Area Codes: 312 630 708 773 815 847
Cook County is the 10th largest of 102 Illinois counties.
Cook County is the most populous of 102 Illinois counties and 2nd most populous county in the nation.
The average home costs $178,856.15 in Cook County with 2.78 people per household.
CBSA: Chicago-Naperville-Joliet, IL-IN-WI (Metro)
MSA: Chicago-Gary-Kenosha, IL-IN-WI CMSA