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US ZIP Code Profile

ZIP Code 78609
Buchanan Dam, Texas

ZIP code 78609 is in Buchanan Dam, located in Llano County, Texas. Its 2020 Census population was 1,827. The estimated median adjusted gross income per tax return is $47,159, and about 6% of filers report $200,000 or more.

2020 Population
1,827
Census ZCTA
County
Llano
FIPS 48299
Median income (est.)
$47,159
IRS SOI 2022
Land Area
23.471 mi²
+ 12.558 mi² water

01Location & Geography

Authoritative geographic identifiers from the U.S. Census Bureau, ANSI, and FIPS standards.

Primary CityBuchanan Dam, TX
CountyLlano County (FIPS 48299)
StateTexas (FIPS 48)
Census Region / DivisionSouth Region · West South Central Division
Coordinates30.765224, -98.45098
Land / Water Area23.471 mi² land · 12.558 mi² water

02Income & Economics

Distribution of the 990 individual tax returns filed in 78609 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
30.3%
$25K–$50K
22.2%
$50K–$75K
15.2%
$75K–$100K
10.1%
$100K–$200K
16.2%
$200K+
6.1%
The $200,000+ bracket accounts for 34% of 78609's total adjusted gross income, from 6% of returns — a concentration that drives the gap between the median ($47,159) and the average.
Estimated median = median adjusted gross income per tax return, interpolated from IRS SOI brackets. Differs from U.S. Census household income.

03Income Over Time

Year-over-year change in 78609's IRS income metrics, 2020–2022.

Median income (2021→2022)
$47,159
▲ 2.1%
Filers earning $200K+
6.1%
▼ 1.0 pt
Total filers
990
▲ 0.0%
GET /zipc/v2/zipcodes/78609/soi?year=… $45K 2020 $46K 2021 $47K 2022
Median = adjusted gross income per return, interpolated from IRS SOI brackets. Figures are nominal (not inflation-adjusted).

04Population Trend

Decennial U.S. Census population for the 78609 ZCTA.

2000
2,175
 
2010
2,012
▼ -7.5%
2020
1,827
▼ -9.2%

05USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortC
USPS Finance Number481170
City AliasesBuchanan Dam, Inks Lake Village

06Frequently Asked Questions

What county is ZIP code 78609 in?

ZIP code 78609 is in Llano County, Texas (county FIPS code 48299).

What city is ZIP code 78609?

The primary USPS city for 78609 is Buchanan Dam, TX.

What is the population of ZIP code 78609?

The 2020 Census population of 78609 was 1,827 residents.

What is the median income in ZIP code 78609?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 78609 is about $47,159, with around 6% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.