Area Code 773
Illinois
Area code 773 serves Illinois, primarily Chicago, in the Central Time (CT) time zone. It has served the region since 12-Oct-1996.
Geographic Coverage
Area code 773 serves Illinois, primarily the Chicago area, in the Central Time (CT). It covers 5 communities. The geographic center of this area code is approximately 41.87°N, 87.75°W.
History
Area code 773 was established in 1996 as a geographic area code.
Demographics
The estimated population served by area code 773 is approximately 2,359,138. The population density is 5,488 people per square mile, which is higher than the national average of 94. The median household income is $81,797, which is near the national median of $78,538. Approximately 41.9% of adults hold a bachelor's degree or higher, compared to the national rate of 35.0%. This rate is higher than the national average. The poverty rate stands at 13.3%, which is near the national rate of 12.4%.
Demographics & Economics
- Total Population
- 2,359,138
- Population Density
- 5,488 people/sq miabove U.S. average (U.S.: 94 people/sq mi)
- Median Household Income
- $81,797near U.S. median (U.S.: $78,538)
- Poverty Rate
- 13.3%near U.S. average (U.S.: 12.4%)
- Unemployment Rate
- 6.9%above U.S. average (U.S.: 5.2%)
- Education Attainment
- Bachelor's Degree+41.9%above U.S. average (U.S.: 35.0%)High School or Lower28.4%
Statistics are population-weighted aggregations from Census ACS 5-year estimates.See Sources for details.
Geographic Coverage
State
IL
Major Cities
- Chicago
- West Chicago
- Norridge
- Riverdale
- Harwood Heights
Time Zone
- Central Time (CT)
Current Time
County Coverage
Population-weighted county share based on aggregated ZCTA population (100% = total mapped population for area code 773).
| County | Population | Share |
|---|---|---|
| Cook, IL | 2,359,138 | 100.0% |
Call Context
This area code includes Chicago and surrounding communities in Illinois.
Nearby Area Codes
Area codes geographically closest to 773.
Other Area Codes in Illinois
Area codes that also serve Illinois, linked for easy comparison.
Frequently Asked Questions
Common questions about area code 773 and how phone numbering works.
Phone numbers are assigned based on where the number was originally provisioned, not the caller's current location. Mobile phones retain their number when users move, and businesses may use numbers from regions where they don't have a physical presence. VoIP services can also provision numbers from virtually any area code.
Yes, mobile phones can have numbers from any area code in the region they were activated. Wireless carriers assign numbers from available pools regardless of phone type. When users change carriers or move to new areas, they typically keep their original number, which may have a different area code than their current location.
Start by looking up the area code on this site to understand its general geographic region. For the specific number, options include using your carrier's caller ID features or checking public directories. If you suspect fraud, you can report it to the FTC. To file a complaint about robocalls or spoofed numbers, visit the FCC Consumer Complaint Center. You can also register your number with the National Do Not Call Registry to reduce unwanted calls. Keep in mind that caller ID can display any name the caller chooses to set.
While Chicago is a prominent city in this area code's coverage, the code serves the broader surrounding region as well. Area codes are assigned geographically and typically cover multiple cities, towns, and communities beyond any single anchor city.
This area code covers a metropolitan region with high population density. Dense urban areas typically have higher call volumes and may have multiple overlapping area codes to meet demand for phone numbers. Businesses and residents in these areas are more likely to need additional numbering resources.
The estimated total population served by area code 773 is based on aggregated U.S. Census Bureau data for the counties within this area code. The population varies significantly between dense urban codes serving millions and rural codes covering smaller populations. You can find the specific population figure in the demographics section above.