ZIP Code 91739 — Rancho Cucamonga, California

    📍 ZIP code 91739 is in Rancho Cucamonga, San Bernardino County, California.

    ZIP code 91739 is located in Rancho Cucamonga, San Bernardino County, California. It is a standard zip code in the Pacific Time Zone with an estimated population of 41,319. The area code for zip code 91739 is 909.

    ZIP
    91739
    City
    Rancho Cucamonga
    County
    San Bernardino County
    State
    California
    Time Zone
    Pacific
    Area Code
    909
    Type
    Standard
    USPS City
    Rancho Cucamonga
    Latitude
    34.1728° N
    Longitude
    117.5212° W
    Land Area
    28.4 sq mi
    Water Area
    0 sq mi

    ZIP Code 91739 Map

    Coordinates: 34.1728°N, 117.5212°W

    ZIP Code 91739 Demographics

    Population

    Total Population41,319
    Density1,455/sq mi
    Median Age36.2
    Male / Female54.3% / 45.7%

    Income & Economy

    Median Household$138,079
    Per Capita$52,167
    Poverty Rate4.8%
    Unemployment4.9%

    Housing

    Total Units12,190
    Owner-Occupied73%
    Renter-Occupied27%
    Median Home Value$798,600
    Median Rent$2,303

    Education

    High School Grad91.9%
    Bachelor's Degree44.5%

    Population and demographic data sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code routing data sourced from the United States Postal Service (USPS).

    Affordability & Profile: ZIP 91739 in Context

    The median home in 91739 is valued at $798,600 against a median household income of $138,079, a price-to-income ratio of 5.8. That is below the 6.7 median across the 1,558 California ZIP codes with published housing data, and well past the 3.0 ratio that marks an attainable market nationally, though it is among the more attainable ratios in the state. Within San Bernardino County, 91739 ranks 52 of 76 ZIPs on affordability (1 = lowest ratio); the county median ratio is 5.3. Renting takes 20.0% of median household income (median rent $2,303 a month), under the 30% cost-burden threshold.

    91739 ranks 206 of 1,558 statewide on median household income and 496 of 1,558 on median home value; its income is far above the $71,552 San Bernardino County median. 73% of households own their home, above the 64% statewide ZIP median, making this a majority-owner ZIP. 45% of adults hold a bachelor's degree or higher, above the 31% median, and the poverty rate is 4.8%, far below the 10.8% statewide ZIP median and among the lowest in the state. Unemployment stands at 4.9%.

    With 1,455 residents per square mile across 28.4 square miles of land, 91739 is denser than the statewide ZIP median of 1,120 (rank 744 of 1,558). This is a low-density pattern of large lots, small towns or scattered subdivisions.

    Ratios and ranks are computed from the ACS figures above across the 1,558 California ZIP codes with published housing data. See the 2026 California affordability report for the statewide analysis and the methodology for definitions.

    Nearby Zip Codes

    Cities & Places Served

    ZIP code 91739 primarily serves Rancho Cucamonga in San Bernardino County, California.

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