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ZIP codes are numbered with the first digit representing a certain group of
U.S. states, the second and third digits together representing a region in that
group (or perhaps a large city) and the fourth and fifth digits representing
more specific areas, such as small towns or regions of that city. The main town
in a region (if applicable) often gets the first ZIP codes for that region;
afterward, the numerical order often follows the alphabetical order.
The first digit of the ZIP code is allocated as follows:
0 = Connecticut (CT), Massachusetts (MA), Maine (ME), New Hampshire (NH), New
Jersey (NJ), Puerto Rico (PR), Rhode Island (RI), Vermont (VT), Virgin Islands
(VI), APO Europe (AE), FPO Europe (AE)
1 = Delaware (DE), New York (NY), Pennsylvania (PA)
2 = District of Columbia (DC), Maryland (MD), North Carolina (NC), South
Carolina (SC), Virginia (VA), West Virginia (WV)
3 = Alabama (AL), Florida (FL), Georgia (GA), Mississippi (MS), Tennessee (TN),
APO Americas (AA), FPO Americas (AA)
4 = Indiana (IN), Kentucky (KY), Michigan (MI), Ohio (OH)
5 = Iowa (IA), Minnesota (MN), Montana (MT), North Dakota (ND), South Dakota
(SD), Wisconsin (WI)
6 = Illinois (IL), Kansas (KS), Missouri (MO), Nebraska (NE)
7 = Arkansas (AR), Louisiana (LA), Oklahoma (OK), Texas (TX)
8 = Arizona (AZ), Colorado (CO), Idaho (ID), New Mexico (NM), Nevada (NV), Utah
(UT), Wyoming (WY)
9 = Alaska (AK), American Samoa (AS), California (CA), Guam (GU), Hawaii (HI),
Northern Mariana Islands (MP), Oregon (OR), Washington (WA), APO Pacific (AP),
FPO Pacific (AP)
The next two digits represent the sectional center facility (e.g. 432xx =
Columbus OH), and the fourth and fifth digits represents the area of the city
(if in a metropolitan area), or a village/town (outside metro areas): 43209
(4=Ohio,32=Columbus,09=Bexley). When a sectional center facility's area crosses
state lines, that facility is assigned separate three-digit prefixes for the
states that it serves; thus, it is possible to identify the state associated
with any ZIP Code just by looking at the first three digits.
List of ZIP code ranges
State or territory Abbr. ZIP code range Notes
Alabama AL 35000-36999
Alaska AK 99500-99999 The highest ZIP Code is in Ketchikan, Alaska, 99950 for
post office boxes.
American Samoa AS 96799
Arizona AZ 85000-86999
Arkansas AR 71600-72999
California CA 90001-96162
Colorado CO 80000-81999
Connecticut CT 06000-06999 excluding 06390
Delaware DE 19700-19999
District of Columbia DC 20000-20099, 20200-20599, and 56900-56999
Federated States of Micronesia FM 96941-96944
Florida FL 32000-34999
Georgia GA 30000-31999 and 39800-39899, plus 39901 39901 is in Atlanta
Guam GU 96910-96932
Hawaii HI 96700-96899
Idaho ID 83200-83999
Illinois IL 60000-62999
Indiana IN 46000-47999
Iowa IA 50000-52999
Kansas KS 66000-67999
Kentucky KY 40000-42799
Louisiana LA 70000-71599
Maine ME 03900-04999
Marshall Islands MH 96960-96970
Maryland MD 20600-21999
Massachusetts MA 01000-02799
Michigan MI 48000-49999
Minnesota MN 55000-56799
Mississippi MS 38600-39999
Missouri MO 63000-65999
Montana MT 59000-59999
Nebraska NE 68000-69999
Nevada NV 88900-89999
New Hampshire NH 03000-03899
New Jersey NJ 07000-08999
New Mexico NM 87000-88499
New York NY 10000-14999 and 06390, 00501, 00544
North Carolina NC 27000-28999
North Dakota ND 58000-58999
Northern Mariana Islands MP 96950-96952
Ohio OH 43000-45999
Oklahoma OK 73000-74999
Oregon OR 97000-97999
Palau PW 96940
Pennsylvania PA 15000-19699
Puerto Rico PR 00600-00799 and 00900-00999
Rhode Island RI 02800-02999
South Carolina SC 29000-29999
South Dakota SD 57000-57999
Tennessee TN 37000-38599
Texas TX 75000-79999 and 88500-88599 all Houston city zip codes begin 770
US Virgin Islands VI 00800-00899
Utah UT 84000-84999
Vermont VT 05000-05999
Virginia VA 20100-20199 and 22000-24699 also some taken from 20000-20099 DC
range
Washington WA 98000-99499
West Virginia WV 24700-26999
Wisconsin WI 53000-54999
Wyoming WY 82000-83199 and 83414
Military mail AA 34002-34078 Armed Forces Americas, with 27 ZIP codes
Military mail AE 09003-09898 Armed Forces Europe/Canada/Middle East/Africa, with
255 ZIP codes
Military mail AP 96201-96562 Armed Forces Pacific, with 66 ZIP codes
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