Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — RANKINGS/PR/SMALLEST-AREA

Smallest ZIP Codes in Puerto Rico by Land Area

What this measures. Land area of the Census tabulation area, smallest first. These are almost always dense urban ZIP codes covering a few city blocks. Source: Census Gazetteer, data release 2026-10-12.

# ZIP City County Land area
1 00906 San Juan San Juan 0.00 sq mi
2 00913 San Juan San Juan 0.32 sq mi
3 00636 Rosario San Germán 0.37 sq mi
4 00912 San Juan San Juan 0.37 sq mi
5 00740 Puerto Real Fajardo 0.42 sq mi
6 00925 San Juan San Juan 0.45 sq mi
7 00968 Guaynabo Guaynabo 0.46 sq mi
8 00911 San Juan San Juan 0.48 sq mi
9 00909 San Juan San Juan 0.65 sq mi
10 00694 Vega Baja Vega Baja 0.80 sq mi
11 00965 Guaynabo Guaynabo 0.91 sq mi
12 00901 San Juan San Juan 1.02 sq mi
13 00951 Toa Baja Toa Baja 1.07 sq mi
14 00917 San Juan San Juan 1.37 sq mi
15 00960 Bayamon Bayamón 1.40 sq mi
16 00915 San Juan San Juan 1.40 sq mi
17 00934 Fort Buchanan Guaynabo 1.42 sq mi
18 00982 Carolina Carolina 1.45 sq mi
19 00786 La Plata Aibonito 1.76 sq mi
20 00923 San Juan San Juan 2.01 sq mi
21 00907 San Juan San Juan 2.04 sq mi
22 00952 Sabana Seca Toa Baja 2.22 sq mi
23 00690 San Antonio Aguadilla 2.26 sq mi
24 00741 Punta Santiago Humacao 2.28 sq mi
25 00717 Ponce Ponce 2.37 sq mi
26 00927 San Juan San Juan 2.42 sq mi
27 00966 Guaynabo Guaynabo 2.52 sq mi
28 00950 Toa Baja Dorado 2.66 sq mi
29 00918 San Juan San Juan 2.70 sq mi
30 00921 San Juan San Juan 3.07 sq mi
31 00631 Castaner Adjuntas 3.13 sq mi
32 00920 San Juan San Juan 3.61 sq mi
33 00979 Carolina Carolina 3.89 sq mi
34 00983 Carolina Carolina 4.32 sq mi
35 00957 Bayamon Bayamón 4.34 sq mi
36 00924 San Juan San Juan 4.66 sq mi
37 00962 Catano Cataño 4.82 sq mi
38 00969 Guaynabo Guaynabo 5.04 sq mi
39 00961 Bayamon Bayamón 5.40 sq mi
40 00959 Bayamon Bayamón 6.09 sq mi
41 00652 Garrochales Arecibo 6.44 sq mi
42 00730 Ponce Ponce 6.64 sq mi
43 00716 Ponce Ponce 8.67 sq mi
44 00704 Aguirre Salinas 9.00 sq mi
45 00985 Carolina Carolina 9.24 sq mi
46 00611 Angeles Utuado 10.65 sq mi
47 00616 Bajadero Arecibo 10.88 sq mi
48 00660 Hormigueros Hormigueros 11.32 sq mi
49 00775 Culebra Culebra 11.65 sq mi
50 00715 Mercedita Ponce 12.71 sq mi

Showing the top 50 of 132 ZIP codes in Puerto Rico that have this figure and meet the threshold above. 00906 ranks 1st at 0.00 sq mi, against 12.71 sq mi in 50th place.

Other rankings for Puerto Rico

Cite this page

zipcodes.pro. “Smallest ZIP Codes in Puerto Rico by Land Area.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/rankings/pr/smallest-area

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