78666 vs 78640 — Compare ZIP Codes
Side-by-side comparison. Blue = ZIP 78666, Orange = ZIP 78640.
Quick verdict: ZIP 78666 is more affordable rent, more diverse, more educated. ZIP 78640 is wealthier, higher home values, lower poverty rate, lower unemployment, higher work-from-home share.
Quick Facts
ZIP 78666
San Marcos city, TX
View full profile →- Population87,775
- Median Income$55,478
- Median Home Value$272k
- Median Rent$1,134
- Median Age27.0 yrs
- Poverty Rate23.3%
ZIP 78640
Kyle city, TX
View full profile →- Population71,460
- Median Income$88,533
- Median Home Value$291k
- Median Rent$1,445
- Median Age33.3 yrs
- Poverty Rate9.2%
Visual comparison (same scale)
Population
87,77571,460
Median Income
$55,478$88,533
Median Home Value
$272k$291k
Median Rent
$1,134$1,445
Median Age
27.0 yrs33.3 yrs
Poverty Rate
23.3%9.2%
Demographics
ZIP 78666
San Marcos city, TX
View full profile →- White %63.7%
- Black %5.2%
- Asian %1.8%
- Hispanic %43.8%
- Age 0–17 %13.8%
- Age 18–64 %73.8%
- Age 65+ %12.5%
- Bachelor's+ %34.6%
- Diversity Index40/100
ZIP 78640
Kyle city, TX
View full profile →- White %55.4%
- Black %5.2%
- Asian %1.1%
- Hispanic %55.3%
- Age 0–17 %27.6%
- Age 18–64 %65.5%
- Age 65+ %6.9%
- Bachelor's+ %29.2%
- Diversity Index38/100
Visual comparison (same scale)
White %
63.7%55.4%
Black %
5.2%5.2%
Asian %
1.8%1.1%
Hispanic %
43.8%55.3%
Age 0–17 %
13.8%27.6%
Age 18–64 %
73.8%65.5%
Age 65+ %
12.5%6.9%
Bachelor's+ %
34.6%29.2%
Diversity Index
40/10038/100
Economy
ZIP 78666
San Marcos city, TX
View full profile →- Median Income$55,478
- Unemployment %5.6%
- IRS Net Migration+4,140
- Work From Home %9.4%
ZIP 78640
Kyle city, TX
View full profile →- Median Income$88,533
- Unemployment %2.8%
- IRS Net Migration+3,371
- Work From Home %10.8%
Visual comparison (same scale)
Median Income
$55,478$88,533
Unemployment %
5.6%2.8%
IRS Net Migration
+4,140+3,371
Work From Home %
9.4%10.8%
Housing
ZIP 78666
San Marcos city, TX
View full profile →- Median Home Value$272k
- Median Rent$1,134
- Owner Occupied %38.4%
- Broadband %85.0%
- Vacant %6.9%
- Median Year Built1997
ZIP 78640
Kyle city, TX
View full profile →- Median Home Value$291k
- Median Rent$1,445
- Owner Occupied %71.9%
- Broadband %94.6%
- Vacant %3.5%
- Median Year Built2008
Visual comparison (same scale)
Median Home Value
$272k$291k
Median Rent
$1,134$1,445
Owner Occupied %
38.4%71.9%
Broadband %
85.0%94.6%
Vacant %
6.9%3.5%
Median Year Built
19972008
Climate & Location
ZIP 78666
San Marcos city, TX
View full profile →- Snow Days/Year0 days
- Elevation (ft)665 ft
- Nearest Airport28.5 miles (45.9 km)
- Distance to Coast98.4 miles (158.3 km)
ZIP 78640
Kyle city, TX
View full profile →- Snow Days/Year0 days
- Elevation (ft)665 ft
- Nearest Airport16.9 miles (27.2 km)
- Distance to Coast100.9 miles (162.3 km)
Visual comparison (same scale)
Snow Days/Year
0 days0 days
Elevation (ft)
665 ft665 ft
Nearest Airport
28.5 miles (45.9 km)16.9 miles (27.2 km)
Distance to Coast
98.4 miles (158.3 km)100.9 miles (162.3 km)
Infrastructure
ZIP 78666
San Marcos city, TX
View full profile →- Work From Home %9.4%
- Walkability (0–100)36
- Broadband %85.0%
Visual comparison (same scale)
Work From Home %
9.4%10.8%
Walkability (0–100)
3635
Broadband %
85.0%94.6%
Frequently Asked Questions
How do ZIP 78666 and 78640 compare?
ZIP 78666 is more affordable rent, more diverse, more educated. ZIP 78640 is wealthier, higher home values, lower poverty rate, lower unemployment, higher work-from-home share.
What do the blue and orange colors mean?
Blue represents the first ZIP (78666), orange the second (78640). The same colors are used in the map markers and comparison bars.
Where does this data come from?
Data is from the U.S. Census Bureau and other federal sources. See our Methodology page for details.
How can I compare other ZIP codes?
From any ZIP page, use the "Compare with Another ZIP" tool, or go to /compare/XXXXX-vs-YYYYY (replace with two 5-digit ZIP codes).
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