A PO BOX number can be less than or more than four digit. For post office boxes, the general rule is that each box has its own ZIP+4 code.
The last four digit is often one of the following:
1. Zero plus the last three digits of the box number (eg. PO BOX 1001, Los Angeles CA 90001-0001).
2. The last four digits of the box number (eg. PO BOX 9991, Twin Peaks CA 92391-9991).
3. If the box number is less than four digits, enough zeros prepended to the front of the box number to produce a four-digit number(eg. PO BOX 1, Shreveport LA 71161-0001).
However, there is no uniform rule, the zip code plus four is for reference only, the ZIP+4 code must be looked up individually for each box in the USPS offical website.
PO BOX 31251, COLORADO SPRINGS, CO 80931-1251
PO BOX 31252, COLORADO SPRINGS, CO 80931-1252
PO BOX 31253, COLORADO SPRINGS, CO 80931-1253
PO BOX 31254, COLORADO SPRINGS, CO 80931-1254
PO BOX 31255, COLORADO SPRINGS, CO 80931-1255
PO BOX 31256, COLORADO SPRINGS, CO 80931-1256
PO BOX 31257, COLORADO SPRINGS, CO 80931-1257
PO BOX 31258, COLORADO SPRINGS, CO 80931-1258
PO BOX 31259, COLORADO SPRINGS, CO 80931-1259
PO BOX 31260, COLORADO SPRINGS, CO 80931-1260
PO BOX 31261, COLORADO SPRINGS, CO 80931-1261
PO BOX 31262, COLORADO SPRINGS, CO 80931-1262
PO BOX 31263, COLORADO SPRINGS, CO 80931-1263
PO BOX 31264, COLORADO SPRINGS, CO 80931-1264
PO BOX 31265, COLORADO SPRINGS, CO 80931-1265
PO BOX 31266, COLORADO SPRINGS, CO 80931-1266
PO BOX 31267, COLORADO SPRINGS, CO 80931-1267
PO BOX 31268, COLORADO SPRINGS, CO 80931-1268
PO BOX 31269, COLORADO SPRINGS, CO 80931-1269
PO BOX 31270, COLORADO SPRINGS, CO 80931-1270
PO BOX 31271, COLORADO SPRINGS, CO 80931-1271
PO BOX 31272, COLORADO SPRINGS, CO 80931-1272
PO BOX 31273, COLORADO SPRINGS, CO 80931-1273
PO BOX 31274, COLORADO SPRINGS, CO 80931-1274
PO BOX 31275, COLORADO SPRINGS, CO 80931-1275
PO BOX 31276, COLORADO SPRINGS, CO 80931-1276
PO BOX 31277, COLORADO SPRINGS, CO 80931-1277
PO BOX 31278, COLORADO SPRINGS, CO 80931-1278
PO BOX 31279, COLORADO SPRINGS, CO 80931-1279
PO BOX 31280, COLORADO SPRINGS, CO 80931-1280
PO BOX 31281, COLORADO SPRINGS, CO 80931-1281
PO BOX 31282, COLORADO SPRINGS, CO 80931-1282
PO BOX 31283, COLORADO SPRINGS, CO 80931-1283
PO BOX 31284, COLORADO SPRINGS, CO 80931-1284
PO BOX 31285, COLORADO SPRINGS, CO 80931-1285
PO BOX 31286, COLORADO SPRINGS, CO 80931-1286
PO BOX 31287, COLORADO SPRINGS, CO 80931-1287
PO BOX 31288, COLORADO SPRINGS, CO 80931-1288
PO BOX 31289, COLORADO SPRINGS, CO 80931-1289
PO BOX 31290, COLORADO SPRINGS, CO 80931-1290
PO BOX 31291, COLORADO SPRINGS, CO 80931-1291
PO BOX 31292, COLORADO SPRINGS, CO 80931-1292
PO BOX 31293, COLORADO SPRINGS, CO 80931-1293
PO BOX 31294, COLORADO SPRINGS, CO 80931-1294
PO BOX 31295, COLORADO SPRINGS, CO 80931-1295
PO BOX 31296, COLORADO SPRINGS, CO 80931-1296
PO BOX 31297, COLORADO SPRINGS, CO 80931-1297
PO BOX 31298, COLORADO SPRINGS, CO 80931-1298
PO BOX 31299, COLORADO SPRINGS, CO 80931-1299
PO BOX 31300, COLORADO SPRINGS, CO 80931-1300
PO BOX 31301, COLORADO SPRINGS, CO 80931-1301
PO BOX 31302, COLORADO SPRINGS, CO 80931-1302
PO BOX 31303, COLORADO SPRINGS, CO 80931-1303
PO BOX 31304, COLORADO SPRINGS, CO 80931-1304
PO BOX 31305, COLORADO SPRINGS, CO 80931-1305
PO BOX 31306, COLORADO SPRINGS, CO 80931-1306
PO BOX 31307, COLORADO SPRINGS, CO 80931-1307
PO BOX 31308, COLORADO SPRINGS, CO 80931-1308
PO BOX 31309, COLORADO SPRINGS, CO 80931-1309
PO BOX 31310, COLORADO SPRINGS, CO 80931-1310
PO BOX 31311, COLORADO SPRINGS, CO 80931-1311
PO BOX 31312, COLORADO SPRINGS, CO 80931-1312
PO BOX 31313, COLORADO SPRINGS, CO 80931-1313
PO BOX 31314, COLORADO SPRINGS, CO 80931-1314
PO BOX 31315, COLORADO SPRINGS, CO 80931-1315
PO BOX 31316, COLORADO SPRINGS, CO 80931-1316
PO BOX 31317, COLORADO SPRINGS, CO 80931-1317
PO BOX 31318, COLORADO SPRINGS, CO 80931-1318
PO BOX 31319, COLORADO SPRINGS, CO 80931-1319
PO BOX 31320, COLORADO SPRINGS, CO 80931-1320
PO BOX 31321, COLORADO SPRINGS, CO 80931-1321
PO BOX 31322, COLORADO SPRINGS, CO 80931-1322
PO BOX 31323, COLORADO SPRINGS, CO 80931-1323
PO BOX 31324, COLORADO SPRINGS, CO 80931-1324
PO BOX 31325, COLORADO SPRINGS, CO 80931-1325
PO BOX 31326, COLORADO SPRINGS, CO 80931-1326
PO BOX 31327, COLORADO SPRINGS, CO 80931-1327
PO BOX 31328, COLORADO SPRINGS, CO 80931-1328
PO BOX 31329, COLORADO SPRINGS, CO 80931-1329
PO BOX 31330, COLORADO SPRINGS, CO 80931-1330
PO BOX 31331, COLORADO SPRINGS, CO 80931-1331
PO BOX 31332, COLORADO SPRINGS, CO 80931-1332
PO BOX 31333, COLORADO SPRINGS, CO 80931-1333
PO BOX 31334, COLORADO SPRINGS, CO 80931-1334
PO BOX 31335, COLORADO SPRINGS, CO 80931-1335
PO BOX 31336, COLORADO SPRINGS, CO 80931-1336
PO BOX 31337, COLORADO SPRINGS, CO 80931-1337
PO BOX 31338, COLORADO SPRINGS, CO 80931-1338
PO BOX 31339, COLORADO SPRINGS, CO 80931-1339
PO BOX 31340, COLORADO SPRINGS, CO 80931-1340
PO BOX 31341, COLORADO SPRINGS, CO 80931-1341
PO BOX 31342, COLORADO SPRINGS, CO 80931-1342
PO BOX 31343, COLORADO SPRINGS, CO 80931-1343
PO BOX 31344, COLORADO SPRINGS, CO 80931-1344
PO BOX 31345, COLORADO SPRINGS, CO 80931-1345
PO BOX 31346, COLORADO SPRINGS, CO 80931-1346
PO BOX 31347, COLORADO SPRINGS, CO 80931-1347
PO BOX 31348, COLORADO SPRINGS, CO 80931-1348
PO BOX 31349, COLORADO SPRINGS, CO 80931-1349
PO BOX 31350, COLORADO SPRINGS, CO 80931-1350
PO BOX 31351, COLORADO SPRINGS, CO 80931-1351
PO BOX 31352, COLORADO SPRINGS, CO 80931-1352
PO BOX 31353, COLORADO SPRINGS, CO 80931-1353
PO BOX 31354, COLORADO SPRINGS, CO 80931-1354
PO BOX 31355, COLORADO SPRINGS, CO 80931-1355
PO BOX 31356, COLORADO SPRINGS, CO 80931-1356
PO BOX 31357, COLORADO SPRINGS, CO 80931-1357
PO BOX 31358, COLORADO SPRINGS, CO 80931-1358
PO BOX 31359, COLORADO SPRINGS, CO 80931-1359
PO BOX 31360, COLORADO SPRINGS, CO 80931-1360
PO BOX 31361, COLORADO SPRINGS, CO 80931-1361
PO BOX 31362, COLORADO SPRINGS, CO 80931-1362
PO BOX 31363, COLORADO SPRINGS, CO 80931-1363
PO BOX 31364, COLORADO SPRINGS, CO 80931-1364
PO BOX 31365, COLORADO SPRINGS, CO 80931-1365
PO BOX 31366, COLORADO SPRINGS, CO 80931-1366
PO BOX 31367, COLORADO SPRINGS, CO 80931-1367
PO BOX 31368, COLORADO SPRINGS, CO 80931-1368
PO BOX 31369, COLORADO SPRINGS, CO 80931-1369
PO BOX 31370, COLORADO SPRINGS, CO 80931-1370
PO BOX 31371, COLORADO SPRINGS, CO 80931-1371
PO BOX 31372, COLORADO SPRINGS, CO 80931-1372
PO BOX 31373, COLORADO SPRINGS, CO 80931-1373
PO BOX 31374, COLORADO SPRINGS, CO 80931-1374
PO BOX 31375, COLORADO SPRINGS, CO 80931-1375
PO BOX 31376, COLORADO SPRINGS, CO 80931-1376
PO BOX 31377, COLORADO SPRINGS, CO 80931-1377
PO BOX 31378, COLORADO SPRINGS, CO 80931-1378
PO BOX 31379, COLORADO SPRINGS, CO 80931-1379
PO BOX 31380, COLORADO SPRINGS, CO 80931-1380
PO BOX 31381, COLORADO SPRINGS, CO 80931-1381
PO BOX 31382, COLORADO SPRINGS, CO 80931-1382
PO BOX 31383, COLORADO SPRINGS, CO 80931-1383
PO BOX 31384, COLORADO SPRINGS, CO 80931-1384
PO BOX 31385, COLORADO SPRINGS, CO 80931-1385
PO BOX 31386, COLORADO SPRINGS, CO 80931-1386
PO BOX 31387, COLORADO SPRINGS, CO 80931-1387
PO BOX 31388, COLORADO SPRINGS, CO 80931-1388
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