| City: | Rock Island, Texas |
| County: | Colorado County |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 9:43:14 AM |
| Population: | 276 [See All] |
| Area Code: | 979 |
| Classification: | PO Box |
| Coordinates: | 29.4745, -96.5797 |
| Land Area: | 28.54 sq mi |
| Quick Link: |
The post office maintains 168 PO Boxes for 122 households. That's an adoption rate of 1.38, meaning the post office serves more than just the immediate community. Surrounding areas without carrier delivery come here for mail service. Two rural carrier routes handle street delivery along County Road 118, County Road 141, Tuttle Street, and Elsie Street.
The median household income sits at $38,977, below the national average. Median home values aren't reported. The community skews older with a median age of 44.5 years. About 85% of working residents are employed, with 32 people working in production, transportation, or material moving occupations. Only 12 people work in service jobs.
This is a working-class rural community, not a getaway destination. The "island" name likely references the geography along the Colorado River rather than any resort character. People here use PO Boxes because rural routes don't reach every property, and the post office has become a central gathering point for the wider area.
The street network consists mainly of county roads with two small residential streets, typical of rural Texas communities where county-maintained roads connect scattered properties rather than forming traditional town grids.
ZIP Code 77470 has 276 residents and 122 households (average 2.26 persons per household). The median age is 44.5 years, significantly older than the state (35.6) and older than the nation (38.8). The gender split is 48.2% male and 51.8% female, which is slightly lower than the state male share (49.4%), making this a female-majority area. Largest groups are White (68.8%, much higher than the state average of 50.1% and well above the national average of 61.6%) and Hispanic or Latino (23.2%); Hispanic or Latino residents make up 23.2%, which is much lower than the state average (39.3%).
Explore More:Population Over TimeBy Age & GenderBy RaceBy GenderNativity & Citizenship
| 2020 Population: | 276Source: Census DHC |
| 2024 ACS Population Estimate: | 414Source: Census ACS |
| 2026 ZC Population Estimate: | 0Source: ZIP-Codes.com |
| Population Density: | 9.7 people per sq mile |
| Average Income: | $43,149Source: Census ACS |
| Households: | 122Source: Census DHC |
| Average House Value: | $122,800Source: Census ACS |
| Persons Per Household: | 2.26Source: Census DHC |
| Average Family Size: | 2.68Source: Census ACS |
| Group | 2010 | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Census ACS Population Estimate | -- | 293 | 250 | 208 | 429 | 313 | 353 | 399 | 465 | 374 | 456 | 458 | 404 | 381 | 414 |
| Decennial Census | 338 | -- | -- | -- | -- | -- | -- | -- | -- | -- | 276 | -- | -- | -- | -- |
Median Age: 44.5
Male Median Age: 42.9
Female Median Age: 47.4
| Group | < 5 | 5-9 | 10-14 | 15-19 | 20-24 | 25-29 | 30-34 | 35-39 | 40-44 | 45-49 | 50-54 | 55-59 | 60-64 | 65-69 | 70-74 | 75-79 | 80-84 | 85+ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Male | 6 | 8 | 8 | 7 | 11 | 4 | 7 | 6 | 16 | 7 | 14 | 9 | 10 | 8 | 1 | 4 | 5 | 2 |
| Female | 8 | 7 | 10 | 5 | 10 | 7 | 8 | 7 | 6 | 8 | 8 | 12 | 12 | 13 | 13 | 6 | 0 | 3 |
| Total | 14 | 15 | 18 | 12 | 21 | 11 | 15 | 13 | 22 | 15 | 22 | 21 | 22 | 21 | 14 | 10 | 5 | 5 |
| White: | 190 | 60.32% |
| Black: | 15 | 4.76% |
| Hispanic:* | 64 | 20.32% |
| Asian: | 0 | 0% |
| American Indian: | 0 | 0% |
| Hawaiian: | 0 | 0% |
| Other: | 46 | 14.60% |
| Total: | 315 | 100% |
| Gender | Count | % | Median Age |
|---|---|---|---|
| Males: | 133 | 48.19% | 42.9 years |
| Females: | 143 | 51.81% | 47.4 years |
| Total: | 276 | 100% | 44.5 years |
| Native, born in the United States: | 414 | 100.00% |
| Native, born in PR, Island Areas, or abroad: | 0 | 0.00% |
| Foreign born, naturalized U.S. citizen: | 0 | 0.00% |
| Foreign born, not a U.S. citizen: | 0 | 0.00% |
| Total Population: | 414 | 100% |
| Total Native Population: | 414 | 100.00% |
| Total Foreign-born Population: | 0 | 0.00% |
In 2024, the Median household income is $43,149, which is much lower than the national median ($78,538), is up $4,172 (10.7%) since 2011 and below its 2019 pre-pandemic level by $6,737. Family households earn a median of $44,207 versus $13,707 for nonfamily households (a difference of $30,500). By gender, male median income is $37,007 and female is $18,726, which is considerably lower than the national female median ($53,445), with a current gap of $18,281 that has widened from 2011 to 2024. The labor-force participation rate is 39.8%, which is markedly below the national rate (63.5%). The unemployment rate is 9.3%, which is far worse than the national rate (5.2%). The largest occupation group is Management (50.4%).
Explore More:Income Over TimeHousehold IncomeEmployment StatusBy Occupation
| Income Type | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Median Household Income | $38,977 | $41,705 | $34,667 | $40,655 | $25,833 | $41,250 | $0 | $43,274 | $49,886 | $45,000 | $44,020 | $48,478 | $38,977 | $43,149 |
| Median Family Income | $73,375 | $50,417 | $24,904 | $48,452 | $0 | $47,500 | $32,500 | $46,875 | $55,625 | $48,000 | $44,167 | $49,321 | $48,036 | $44,207 |
| Median NonFamily Income | $34,122 | $34,154 | $0 | $35,662 | $0 | $2,499 | $0 | $0 | $0 | $0 | $0 | $0 | $13,750 | $13,707 |
| Median Male Income | $33,350 | $33,289 | $23,636 | $22,900 | $0 | $36,500 | $30,658 | $30,843 | $34,474 | $33,036 | $32,255 | $35,357 | $37,143 | $37,007 |
| Median Female Income | $25,227 | $26,908 | $0 | $0 | $0 | $0 | $0 | $23,875 | $0 | $22,750 | $25,735 | $0 | $16,023 | $18,726 |
| Employed: | 127 | 36.08% |
| Unemployed: | 13 | 3.69% |
| Not In Labor Force: | 212 | 60.23% |
| Total: | 352 | 100% |
| Management, business, science, and arts: | 64 | 50.39% |
| Service: | 20 | 15.75% |
| Sales and Office: | 43 | 33.86% |
| Natural resources, construction, and maintenance: | 0 | 0.00% |
| Production, transportation, and material moving: | 0 | 0.00% |
| Total Civilian Employed Population: | 127 | 100% |
In 2024, the median home value is $122,800, which is far less than the national median ($303,400), is up $50,300 (69.38%) since 2011 and above its 2019 pre-pandemic level by $38,500. The median gross rent is $0, which is well under the national median ($1,348), and above its 2019 pre-pandemic level by $0. Of occupied housing, owners make up 94.65% (33.90% with a mortgage, 66.10% free-and-clear) and renters 5.35% - making this ZIP Code under national rental averages. The vacancy rate is 29.96%, which is markedly above the national rate (10.43%).
Explore More:Compare Home ValueHome Value Over TimeRent & Over TimeHousing Occupancy
| Group | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Median Home Value | $72,500 | $71,300 | $63,300 | $61,600 | $65,000 | $35,200 | $0 | $54,800 | $84,300 | $0 | $0 | $149,200 | $0 | $122,800 |
| Less than $500: | 0 | 0.00% |
| $500 to $999: | 0 | 0.00% |
| $1,000 to $1,499: | 0 | 0.00% |
| $1,500 to $1,999: | 0 | 0.00% |
| $2,000 to $2,499: | 0 | 0.00% |
| $2,500 to $2,999: | 0 | 0.00% |
| $3,000 or more: | 0 | 0.00% |
| No Rent: | 10 | 100.00% |
| Total: | 10 | 100% |
| Group | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Median Rent | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 |
| Owner Occupied (with mortgage): | 60 | 32.09% |
| Owner Occupied (free and clear, no mortgage): | 117 | 62.57% |
| Renter Occupied: | 10 | 5.35% |
| Total Occupied Housing Units: | 187 | 100% |
| Occupied Housing Units: | 187 | 70.04% |
| Vacant Housing Units (not graphed): | 80 | 29.96% |
| Total Housing Units: | 267 | 100% |
| Single-Family Units: | 168 | 62.92% |
| Multi-Family Units: | 0 | 0.00% |
| Other Units: | 99 | 37.08% |
| Total Housing Units: | 267 | 100% |
In 2024, 10.40% of adults (25+) have a bachelor's degree or higher, which is far lower than the national rate (35.00%). High school or higher is 92.20%, which is comparable to the national rate (89.40%). The uninsured rate is 11.10%, which is comparable to the national rate (8.60%). The share of people in poverty is 0.00%, which is comparable to the national rate (8.70%), up 2.70 percentage points since 2011 and above its 2019 pre-pandemic level by 1.70 percentage points. This points to rising hardship - a weaker consumer base, greater strain on public services, and job-market headwinds. Among residents ages 3+, the largest enrollment group is high school (100.00%). College enrollment is 0.00%, which is comparable to the national rate (26.70%), meaning the community mirrors broader higher-education participation.
Explore More:Educational AttainmentHealth InsurancePoverty Over TimeSchool Enrollment
| Less than 9th grade: | 0 | 0.00% |
| 9th to 12th grade, no diploma: | 24 | 7.77% |
| High school graduate (includes equivalency): | 139 | 44.98% |
| Some college, no degree: | 80 | 25.89% |
| Associate's degree: | 34 | 11.00% |
| Bachelor's degree: | 15 | 4.85% |
| Graduate or professional degree: | 17 | 5.50% |
| Total: | 309 | 100% |
| High school or higher: | 285 | 92.23% |
| Bachelor's degree or higher: | 32 | 10.36% |
| Private Insurance: | 228 | 47.01% |
| Public Insurance: | 211 | 43.51% |
| No Insurance: | 46 | 9.48% |
| Total: | 485 | 100% |
| Has Health Insurance: | 439 | 90.52% |
| Group | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| % of People in Poverty | 15.8% | 17.2% | 28.1% | 18.1% | 32.9% | 6.5% | 20.2% | 13.3% | 16.8% | 11.3% | 15.1% | 11.3% | 18.5% | 0.0% |
Note: Counts of Families & People in poverty are not published at the ZIP Code level due to small sample sizes. Percentages shown are survey estimates from the American Community Survey (ACS). They may differ from official poverty statistics. The U.S. Census Bureau defines poverty status by comparing a family's or individual's total income with federal poverty thresholds that vary by family size and composition.
| Nursery School, Preschool: | 0 | 0.00% |
| Kindergarten: | 0 | 0.00% |
| Elementary school (grades 1-8): | 0 | 0.00% |
| High school (grades 9-12): | 91 | 100.00% |
| College or graduate school: | 0 | 0.00% |
| Total: | 91 | 100% |
| Early Childhood: | 0 | 0.00% |
| K-12 (Primary & Secondary School): | 91 | 100.00% |
ZIP Code 77470 is designated for PO Box delivery only; business establishment and employment data are not available.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 20,139Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 0Source: CBP |
| 1st Quarter Payroll: | $0Source: CBP |
| Annual Payroll: | $0Source: CBP |
| # of Employees: | 0Source: CBP |
ZIP Code 77470 is located in Colorado County, Texas, within the Metropolitan Statistical Area (CBSA ) and Texas's 10th Congressional District. This area has a population of 0 people, about 0.00% of whom live in ZIP Code 77470. It covers 28.54 sq mi of land and a water area of 0.369 sq mi.
| CBSA Name: | --Source: Census |
| CBSA Number: | --Source: Census |
| CBSA Type: | --Source: Census |
| CBSA Division: | --Source: Census |
| CBSA Population: | 0Source: Census |
| MSA: | Source: Census |
| Land Area: | 28.54 sq miSource: Census |
| Water Area: | 0.369 sq miSource: Census |
| Congressional District: | 10Source: USPS |
| Congressional Land Area: | 5070.95 sq miSource: Census |
| PMSA: | Source: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 4862732Source: Census |
| Place Name: | Rock Island CDP; TexasSource: Census |
We could not locate which school district 77470 belongs to, but we will update this once new district data is released. There are no public schools nor private schools with a mailing address in this ZIP Code. Listing Nearby schools instead. It also has 6 colleges, universities or post secondary education institutions nearby which would be a short commute to.
Our sources include trusted federal and licensed data from the United States Postal Service, U.S. Census Bureau, U.S. Geological Survey, Centers for Medicare & Medicaid Services, and the National Center for Education Statistics, along with proprietary datasets created by ZIP-Codes.com. Data last updated on February 1, 2026.