Area Code 435

Utah

Area code 435 serves Utah, primarily St. George, in the Mountain Time (MT) time zone. It was created from a split of area code 801.

Split Area Code

This area code was created by splitting an existing area code into separate geographic regions. When a split occurs, some customers in the original area code region are assigned the new area code.

This area code was split from area code 801 (Salt Lake City).

In service since: 21-Sep-1997

Learn more about overlay and split area codes →

Demographics & Economics

Total Population: 940,044
Population Density: 10 people/sq mi
below U.S. average (U.S.: 93 people/sq mi)
Median Household Income: $76,411
near U.S. median (U.S.: $75,144)
Poverty Rate: 10.2%
below U.S. average (U.S.: 11.5%)
Unemployment Rate: 3.6%
near U.S. average (U.S.: 3.6%)
Education Attainment: Bachelor's Degree+
31.8%
near U.S. average (U.S.: 33.7%)
High School or Lower
27.9%

Statistics are population-weighted aggregations from Census ACS 5-year estimates. Population figures are approximate — see Sources & Methodology for details on how area code populations are derived.

See how this area code compares to all US area codes in the Statistics dashboard.

Time Zone

Mountain Time (MT)

NANPA Relief Status

According to the latest NANPA analysis (July 2026), this area code is not currently listed as exhausting within the next 36 months. No relief planning is in progress for this NPA.

Source: NANPA NPA Relief Planning Reports · See all relief planning statuses

Current Time

Mountain Time (MT)

Prefix Utilization

Geographic Coverage

State

Major Cities

St. George
Logan
Tooele
Cedar City
Washington
Hurricane
Heber
Smithfield
Grantsville
North Logan
Stansbury Park
Tremonton
Vernal
Hyrum
Ivins
Providence
Summit Park
Price
Richfield
Santa Clara
Enoch
Nibley
Roosevelt
Nephi

and 218 more cities

Area Code 435 geographic coverage map (light mode)

Historical Timeline of Area Code 435

On September 21, 1997, area code 435 went into service as a split from area code 801, covering all of Utah outside the Wasatch Front. The Utah Public Service Commission issued Docket No. 99-999-05 ordering the split to preserve 7-digit local dialing in the growing Salt Lake City metro area. The geographic separation created one of six doughnut area codes in the North American Numbering Plan, with 435 completely surrounding 801 and its later overlay, 385. Source: Utah PSC Docket 99-999-05

Key milestones:

1997: Area code 435 was created on September 21 through a geographic split of 801, assigning the new code to communities outside Salt Lake, Davis, Weber, Utah, and Morgan counties. Source: Deseret News
2002: The Winter Olympics in Salt Lake City brought $5 billion in economic impact to Utah. Park City, located within the 435 area, hosted alpine skiing and bobsled events. Source: Wikipedia
2007: The PSC approved area code 385 as an overlay on 801 rather than pursuing a second geographic split, reversing the earlier policy preference for splits. Source: Utah PSC
Present: Prefix utilization stands at 62% (496 of 800 prefixes assigned) with no active NANPA relief planning. The code is not projected to exhaust until 2041. Source: Wikipedia.

The doughnut configuration of 435 around 801 and 385 reflects Utah's population concentration along the Wasatch Front, while the broader region encompasses desert, mountain, and canyon communities stretching across four states.

Regulatory History

The Utah Public Service Commission holds delegated numbering authority from the FCC for area code decisions within the state. Two key regulatory actions shaped the current configuration of area codes in Utah. Source: Utah PSC Docket 99-999-05

Year	Event	Docket	Regulatory Action & Impact
1997	Geographic split of 801	99-999-05	The PSC ordered the creation of 435 to serve all communities outside the Wasatch Front metro area, keeping 801 for the five core counties along the urban corridor. A split was chosen over an overlay to maintain 7-digit local dialing in the Salt Lake City region. Source: Utah PSC
2007	Overlay approval for 801	99-999-05	Reversing its earlier split-based approach, the PSC authorized 385 as a fourth code overlaid on the original Wasatch Front NPA. Continued population growth along the urban corridor made an additional split impractical. Source: Utah PSC
Present	No active relief planning	N/A	With 62% prefix utilization (496 of 800 assigned) and no overlay or split pending, 435 is projected to remain in service without exhaustion until 2041. NANPA shows no active relief planning for this code.

County Coverage

Population-weighted county share based on aggregated ZCTA population (100% = total mapped population for area code 435).

County	Population	Share
Washington, UT	214,236	22.8%
Cache, UT	137,031	14.6%
Tooele, UT	76,731	8.2%
Box Elder, UT	73,584	7.8%
Iron, UT	61,500	6.5%
Summit, UT	60,179	6.4%
Wasatch, UT	50,425	5.4%
Uintah, UT	49,890	5.3%
Sanpete, UT	29,590	3.1%
San Juan, UT	23,184	2.5%
Duchesne, UT	22,954	2.4%
Sevier, UT	21,858	2.3%
Carbon, UT	20,446	2.2%
Millard, UT	14,955	1.6%
Uinta, WY	14,836	1.6%
Juab, UT	12,808	1.4%
Grand, UT	11,519	1.2%
Emery, UT	9,968	1.1%
Kane, UT	8,020	0.9%
Beaver, UT	7,172	0.8%
Garfield, UT	5,791	0.6%
Utah, UT	3,243	0.3%
Rich, UT	2,588	0.3%
Wayne, UT	2,545	0.3%
Piute, UT	2,081	0.2%
Navajo, AZ	1,391	0.1%
Daggett, UT	735	0.1%
Apache, AZ	640	0.1%
White Pine, NV	144	0.0%