| ZIP Codes: | 35 ZIP Codes (16 Standard, 16 PO Box, 3 Unique) [See All] |
| Area Codes: | 787 / 939 |
| Timezone: | GMT -04:00 |
| Local Time: | 2:13:37 PM |
| Population: | 340,403 [See All] |
| FIPS: | 72127 |
| CBSA: | San Juan-Bayamon-Caguas, PR |
| Land Area: | 57 sq mi |
| Water Area: | 7 sq mi |
| Coordinates: | 18.4274, -66.0670 |
| Quick Link: |
340,403 residents live across 35 ZIPs covering 57 sq mi, served by 1 distinct USPS-recognized cities.
Population moved from 387,682 to 340,403 from 2014 to 2024 — a -12.2% change. 1 ZIPs gained residents, 16 lost.
The county's wealthiest ZIP 00911 (San Juan, $42,382 median) and poorest ZIP 00913 (San Juan, $7,049) are 0.9 miles apart — a 6.0× income gap across local geography.
Median home values vary 5.4× across this county — from $110,000 in 00915 (San Juan) to $595,100 in 00911 (San Juan).
Density varies 6× across the county — from 3,168 people/sq mi in 00926 (San Juan) to 19,265 in 00912 (San Juan).
Within Puerto Rico, this is the #1 most populous of 78 counties and ranks #15 for median household income .
On the national stage, San Juan County is .
Hosts 3 single-entity Unique ZIPs: 00975Bureau Of Census ; 00935Centro Medico Metropolitano ; and 00939Unique Brm .
Weighted by population, the typical household earns about $30,258 across the county — reflecting what a typical resident sees, not a simple ZIP average.
16 Standard delivery, 16 PO Box only, 3 single-entity Unique ZIPs serve this county.
3 ZIP codes in this county serve a single facility — typically theme parks, universities, large corporations, airports, or government complexes.
Median household income spans 6.0× between the wealthiest and poorest ZIPs — a sign of significant intra-county inequality.
San Juan County lost 12.4% of residents between 2014 and 2024. ZIPs that shed the largest share:
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 00926 | San Juan | Standard | 92,284 | $40,606 | 29.1 | -12.2% |
| 00924 | San Juan | Standard | 49,922 | $25,724 | 4.8 | -11.2% |
| 00921 | San Juan | Standard | 33,119 | $23,598 | 2.8 | -14.0% |
| 00915 | San Juan | Standard | 24,607 | $16,590 | 1.6 | -19.7% |
| 00923 | San Juan | Standard | 24,551 | $20,349 | 2.3 | -11.9% |
| 00917 | San Juan | Standard | 17,116 | $19,357 | 1.4 | -13.2% |
| 00918 | San Juan | Standard | 16,172 | $39,287 | 2.5 | -2.3% |
| 00920 | San Juan | Standard | 15,900 | $30,259 | 4.0 | -15.1% |
| 00907 | San Juan | Standard | 15,817 | $41,615 | 2.0 | -11.7% |
| 00927 | San Juan | Standard | 13,868 | $38,728 | 2.6 | -6.1% |
| 00911 | San Juan | Standard | 7,297 | $42,382 | 0.4 | -1.7% |
| 00913 | San Juan | Standard | 6,943 | $7,049 | 0.4 | -15.1% |
| 00901 | San Juan | Standard | 6,398 | $27,557 | 0.9 | -0.5% |
| 00912 | San Juan | Standard | 5,845 | $31,636 | 0.3 | -8.9% |
| 00909 | San Juan | Standard | 5,633 | $23,101 | 0.7 | -7.2% |
| 00925 | San Juan | Standard | 4,882 | $17,404 | 0.7 | -31.4% |
| 00906 | San Juan | PO Box | 49 | — | 0.0 | 14.0% |
| 00975 | San Juan | Unique | — | — | 0.0 | — |
| 00919 | San Juan | PO Box | — | — | 0.0 | — |
| 00935 | San Juan | Unique | — | — | 0.0 | — |
| 00939 | San Juan | Unique | — | — | 0.0 | — |
| 00955 | San Juan | PO Box | — | — | 0.0 | — |
| 00933 | San Juan | PO Box | — | — | 0.0 | — |
| 00931 | San Juan | PO Box | — | — | 0.0 | — |
| 00928 | San Juan | PO Box | — | — | 0.0 | — |
| 00929 | San Juan | PO Box | — | — | 0.0 | — |
| 00910 | San Juan | PO Box | — | — | 0.0 | — |
| 00937 | San Juan | PO Box | — | — | 0.0 | — |
| 00914 | San Juan | PO Box | — | — | 0.0 | — |
| 00908 | San Juan | PO Box | — | — | 0.0 | — |
| 00922 | San Juan | PO Box | — | — | 0.0 | — |
| 00916 | San Juan | PO Box | — | — | 0.0 | — |
| 00902 | San Juan | PO Box | — | — | 0.0 | — |
| 00936 | San Juan | PO Box | — | — | 0.0 | — |
| 00940 | San Juan | PO Box | — | — | 0.0 | — |