520 Area Code
| State: | Arizona |
| Top City: | Tucson |
| Timezone: | MST (UTC-7) |
| Current Time: |
Where is Area Code 520 located?
Area code 520 is a telephone area code serving the southern part of the U.S. state of Arizona. It covers cities like Tucson, Sierra Vista, Casa Grande, and Nogales.
Whether you’re dialing in from bustling Tucson or the small, charming town of Nogales, you’re using the 520 area code.
520 Area Code Time Zone
The 520 area code is situated in the Mountain Standard Time (MST) zone. But here’s a fun fact: unlike most areas in this time zone, Arizona does not observe daylight saving time. That means, when everyone else is springing forward or falling back, Arizona stays put. This can be a little confusing when scheduling calls, but hey, who said time wasn’t tricky?
History of 520 Area Code
The 520 area code has a long history in Arizona, being one of the original area codes established in 1947 to cover the entire state. However, over the years, the area code underwent multiple splits to accommodate the growing population and demand for telephone numbers.
In 1953, the northern and central portions of Arizona were assigned area code 602, leaving 520 to cover only southern Arizona. Then, in 1988, area code 928 was created to serve northern and central Arizona, further reducing the 520 area to southeastern Arizona.
Despite the splits, the 520 area code remains one of the largest geographic area codes in the United States, encompassing approximately 45,000 square miles. It includes cities such as Tucson, Casa Grande, Green Valley, Sierra Vista, Nogales, and Yuma, with Tucson being the major metropolitan area within the 520 code.
Top 10 Counties in Area Code 520
| County | Population |
| Pima County | 1,044,000 |
| Pinal County | 462,789 |
| Cochise County | 125,922 |
| Santa Cruz County | 46,498 |
| Graham County | 38,837 |
| Yuma County | 35,000 |
| Greenlee County | 9,529 |
| La Paz County | 20,489 |
| Gila County | 54,018 |
| Maricopa County | 4,485,414 |
Top 10 Cities in Area Code 520
| City | Population |
| Tucson | 548,073 |
| Casa Grande | 58,632 |
| Sierra Vista | 43,888 |
| Oro Valley | 45,275 |
| Marana | 45,279 |
| Sahuarita | 31,717 |
| Nogales | 20,233 |
| Florence | 26,513 |
| Eloy | 19,168 |
| Coolidge | 12,698 |
Top Telephone Carriers
| Landline | Wireless |
| AT&T | Verizon Wireless |
| Verizon | AT&T |
| CenturyLink | T-Mobile |
| Cox Communications | Sprint |