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/LA/HIGHEST-DENSITY

Most Densely Populated ZIP Codes in Louisiana

What this measures. People per square mile of land area. Source: Census American Community Survey and Gazetteer, data release 2026-10-12.

# ZIP City County People per sq mi
1 70609 Lake Charles Calcasieu 39,667
2 71209 Monroe Ouachita 24,308
3 70803 Baton Rouge East Baton Rouge 15,288
4 70402 Hammond Tangipahoa 15,041
5 70113 New Orleans Orleans 10,259
6 70119 New Orleans Orleans 8,246
7 70116 New Orleans Orleans 8,212
8 70115 New Orleans Orleans 8,108
9 70118 New Orleans Orleans 7,798
10 70125 New Orleans Orleans 7,609
11 70006 Metairie Jefferson 6,160
12 70065 Kenner Jefferson 6,080
13 70002 Metairie Jefferson 6,022
14 70001 Metairie Jefferson 6,015
15 70056 Gretna Jefferson 5,965
16 70130 New Orleans Orleans 5,886
17 70005 Metairie Jefferson 5,875
18 70003 Metairie Jefferson 5,655
19 70122 New Orleans Orleans 5,623
20 71272 Ruston Lincoln 5,293
21 70053 Gretna Jefferson 4,854
22 70128 New Orleans Orleans 4,819
23 70117 New Orleans Orleans 4,661
24 70114 New Orleans Orleans 4,483
25 70127 New Orleans Orleans 4,224
26 71497 Natchitoches Natchitoches 4,148
27 70123 New Orleans Jefferson 3,613
28 71242 Forest West Carroll 3,571
29 70802 Baton Rouge East Baton Rouge 3,553
30 70112 New Orleans Orleans 3,550
31 71104 Shreveport Caddo 3,310
32 70815 Baton Rouge East Baton Rouge 3,282
33 70813 Baton Rouge East Baton Rouge 3,277
34 70124 New Orleans Orleans 3,258
35 70121 New Orleans Jefferson 3,222
36 70806 Baton Rouge East Baton Rouge 3,176
37 70058 Harvey Jefferson 3,101
38 70457 Saint Benedict St. Tammany 3,043
39 70808 Baton Rouge East Baton Rouge 2,992
40 70816 Baton Rouge East Baton Rouge 2,808
41 70503 Lafayette Lafayette 2,529
42 70062 Kenner Jefferson 2,520
43 70043 Chalmette St. Bernard 2,479
44 70812 Baton Rouge East Baton Rouge 2,455
45 70580 Reddell Evangeline 2,429
46 70575 Perry Vermilion 2,313
47 70032 Arabi St. Bernard 2,264
48 70126 New Orleans Orleans 2,240
49 70131 New Orleans Orleans 2,148
50 71108 Shreveport Caddo 2,133

Showing the top 50 of 539 ZIP codes in Louisiana that have this figure . 70609 ranks 1st at 39,667, against 2,133 in 50th place.

Other rankings for Louisiana

Cite this page

zipcodes.pro. “Most Densely Populated ZIP Codes in Louisiana.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/rankings/la/highest-density

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