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 51261, IDAHO FALLS, ID 83405-1261
PO BOX 51262, IDAHO FALLS, ID 83405-1262
PO BOX 51263, IDAHO FALLS, ID 83405-1263
PO BOX 51264, IDAHO FALLS, ID 83405-1264
PO BOX 51265, IDAHO FALLS, ID 83405-1265
PO BOX 51266, IDAHO FALLS, ID 83405-1266
PO BOX 51267, IDAHO FALLS, ID 83405-1267
PO BOX 51268, IDAHO FALLS, ID 83405-1268
PO BOX 51269, IDAHO FALLS, ID 83405-1269
PO BOX 51270, IDAHO FALLS, ID 83405-1270
PO BOX 51271, IDAHO FALLS, ID 83405-1271
PO BOX 51272, IDAHO FALLS, ID 83405-1272
PO BOX 51273, IDAHO FALLS, ID 83405-1273
PO BOX 51274, IDAHO FALLS, ID 83405-1274
PO BOX 51275, IDAHO FALLS, ID 83405-1275
PO BOX 51276, IDAHO FALLS, ID 83405-1276
PO BOX 51277, IDAHO FALLS, ID 83405-1277
PO BOX 51278, IDAHO FALLS, ID 83405-1278
PO BOX 51279, IDAHO FALLS, ID 83405-1279
PO BOX 51280, IDAHO FALLS, ID 83405-1280
PO BOX 51281, IDAHO FALLS, ID 83405-1281
PO BOX 51282, IDAHO FALLS, ID 83405-1282
PO BOX 51283, IDAHO FALLS, ID 83405-1283
PO BOX 51284, IDAHO FALLS, ID 83405-1284
PO BOX 51285, IDAHO FALLS, ID 83405-1285
PO BOX 51286, IDAHO FALLS, ID 83405-1286
PO BOX 51287, IDAHO FALLS, ID 83405-1287
PO BOX 51288, IDAHO FALLS, ID 83405-1288
PO BOX 51289, IDAHO FALLS, ID 83405-1289
PO BOX 51290, IDAHO FALLS, ID 83405-1290
PO BOX 51291, IDAHO FALLS, ID 83405-1291
PO BOX 51292, IDAHO FALLS, ID 83405-1292
PO BOX 51293, IDAHO FALLS, ID 83405-1293
PO BOX 51294, IDAHO FALLS, ID 83405-1294
PO BOX 51295, IDAHO FALLS, ID 83405-1295
PO BOX 51296, IDAHO FALLS, ID 83405-1296
PO BOX 51297, IDAHO FALLS, ID 83405-1297
PO BOX 51298, IDAHO FALLS, ID 83405-1298
PO BOX 51299, IDAHO FALLS, ID 83405-1299
PO BOX 51300, IDAHO FALLS, ID 83405-1300
PO BOX 51301, IDAHO FALLS, ID 83405-1301
PO BOX 51302, IDAHO FALLS, ID 83405-1302
PO BOX 51303, IDAHO FALLS, ID 83405-1303
PO BOX 51304, IDAHO FALLS, ID 83405-1304
PO BOX 51305, IDAHO FALLS, ID 83405-1305
PO BOX 51306, IDAHO FALLS, ID 83405-1306
PO BOX 51307, IDAHO FALLS, ID 83405-1307
PO BOX 51308, IDAHO FALLS, ID 83405-1308
PO BOX 51309, IDAHO FALLS, ID 83405-1309
PO BOX 51310, IDAHO FALLS, ID 83405-1310
PO BOX 51311, IDAHO FALLS, ID 83405-1311
PO BOX 51312, IDAHO FALLS, ID 83405-1312
PO BOX 51313, IDAHO FALLS, ID 83405-1313
PO BOX 51314, IDAHO FALLS, ID 83405-1314
PO BOX 51315, IDAHO FALLS, ID 83405-1315
PO BOX 51316, IDAHO FALLS, ID 83405-1316
PO BOX 51317, IDAHO FALLS, ID 83405-1317
PO BOX 51318, IDAHO FALLS, ID 83405-1318
PO BOX 51319, IDAHO FALLS, ID 83405-1319
PO BOX 51320, IDAHO FALLS, ID 83405-1320
PO BOX 51321, IDAHO FALLS, ID 83405-1321
PO BOX 51322, IDAHO FALLS, ID 83405-1322
PO BOX 51323, IDAHO FALLS, ID 83405-1323
PO BOX 51324, IDAHO FALLS, ID 83405-1324
PO BOX 51325, IDAHO FALLS, ID 83405-1325
PO BOX 51326, IDAHO FALLS, ID 83405-1326
PO BOX 51327, IDAHO FALLS, ID 83405-1327
PO BOX 51328, IDAHO FALLS, ID 83405-1328
PO BOX 51329, IDAHO FALLS, ID 83405-1329
PO BOX 51330, IDAHO FALLS, ID 83405-1330
PO BOX 51331, IDAHO FALLS, ID 83405-1331
PO BOX 51332, IDAHO FALLS, ID 83405-1332
PO BOX 51333, IDAHO FALLS, ID 83405-1333
PO BOX 51334, IDAHO FALLS, ID 83405-1334
PO BOX 51335, IDAHO FALLS, ID 83405-1335
PO BOX 51336, IDAHO FALLS, ID 83405-1336
PO BOX 51337, IDAHO FALLS, ID 83405-1337
PO BOX 51338, IDAHO FALLS, ID 83405-1338
PO BOX 51339, IDAHO FALLS, ID 83405-1339
PO BOX 51340, IDAHO FALLS, ID 83405-1340
PO BOX 51341, IDAHO FALLS, ID 83405-1341
PO BOX 51342, IDAHO FALLS, ID 83405-1342
PO BOX 51343, IDAHO FALLS, ID 83405-1343
PO BOX 51344, IDAHO FALLS, ID 83405-1344
PO BOX 51345, IDAHO FALLS, ID 83405-1345
PO BOX 51346, IDAHO FALLS, ID 83405-1346
PO BOX 51347, IDAHO FALLS, ID 83405-1347
PO BOX 51348, IDAHO FALLS, ID 83405-1348
PO BOX 51349, IDAHO FALLS, ID 83405-1349
PO BOX 51350, IDAHO FALLS, ID 83405-1350
PO BOX 51351, IDAHO FALLS, ID 83405-1351
PO BOX 51352, IDAHO FALLS, ID 83405-1352
PO BOX 51353, IDAHO FALLS, ID 83405-1353
PO BOX 51354, IDAHO FALLS, ID 83405-1354
PO BOX 51355, IDAHO FALLS, ID 83405-1355
PO BOX 51356, IDAHO FALLS, ID 83405-1356
PO BOX 51357, IDAHO FALLS, ID 83405-1357
PO BOX 51358, IDAHO FALLS, ID 83405-1358
PO BOX 51359, IDAHO FALLS, ID 83405-1359
PO BOX 51360, IDAHO FALLS, ID 83405-1360
PO BOX 51361, IDAHO FALLS, ID 83405-1361
PO BOX 51362, IDAHO FALLS, ID 83405-1362
PO BOX 51363, IDAHO FALLS, ID 83405-1363
PO BOX 51364, IDAHO FALLS, ID 83405-1364
PO BOX 51365, IDAHO FALLS, ID 83405-1365
PO BOX 51366, IDAHO FALLS, ID 83405-1366
PO BOX 51367, IDAHO FALLS, ID 83405-1367
PO BOX 51368, IDAHO FALLS, ID 83405-1368
PO BOX 51369, IDAHO FALLS, ID 83405-1369
PO BOX 51370, IDAHO FALLS, ID 83405-1370
PO BOX 51371, IDAHO FALLS, ID 83405-1371
PO BOX 51372, IDAHO FALLS, ID 83405-1372
PO BOX 51373, IDAHO FALLS, ID 83405-1373
PO BOX 51374, IDAHO FALLS, ID 83405-1374
PO BOX 51375, IDAHO FALLS, ID 83405-1375
PO BOX 51376, IDAHO FALLS, ID 83405-1376
PO BOX 51377, IDAHO FALLS, ID 83405-1377
PO BOX 51378, IDAHO FALLS, ID 83405-1378
PO BOX 51379, IDAHO FALLS, ID 83405-1379
PO BOX 51380, IDAHO FALLS, ID 83405-1380
PO BOX 51381, IDAHO FALLS, ID 83405-1381
PO BOX 51382, IDAHO FALLS, ID 83405-1382
PO BOX 51383, IDAHO FALLS, ID 83405-1383
PO BOX 51384, IDAHO FALLS, ID 83405-1384
PO BOX 51385, IDAHO FALLS, ID 83405-1385
PO BOX 51386, IDAHO FALLS, ID 83405-1386
PO BOX 51387, IDAHO FALLS, ID 83405-1387
PO BOX 51388, IDAHO FALLS, ID 83405-1388
PO BOX 51389, IDAHO FALLS, ID 83405-1389
PO BOX 51390, IDAHO FALLS, ID 83405-1390
PO BOX 51391, IDAHO FALLS, ID 83405-1391
PO BOX 51392, IDAHO FALLS, ID 83405-1392
PO BOX 51393, IDAHO FALLS, ID 83405-1393
PO BOX 51394, IDAHO FALLS, ID 83405-1394
PO BOX 51395, IDAHO FALLS, ID 83405-1395
PO BOX 51396, IDAHO FALLS, ID 83405-1396
PO BOX 51397, IDAHO FALLS, ID 83405-1397
PO BOX 51398, IDAHO FALLS, ID 83405-1398
PO BOX 51399, IDAHO FALLS, ID 83405-1399
PO BOX 51400, IDAHO FALLS, ID 83405-1400
PO BOX 51401, IDAHO FALLS, ID 83405-1401
PO BOX 51402, IDAHO FALLS, ID 83405-1402
PO BOX 51403, IDAHO FALLS, ID 83405-1403
PO BOX 51404, IDAHO FALLS, ID 83405-1404
PO BOX 51405, IDAHO FALLS, ID 83405-1405
PO BOX 51406, IDAHO FALLS, ID 83405-1406
PO BOX 51407, IDAHO FALLS, ID 83405-1407
PO BOX 51408, IDAHO FALLS, ID 83405-1408
PO BOX 51409, IDAHO FALLS, ID 83405-1409
PO BOX 51410, IDAHO FALLS, ID 83405-1410
PO BOX 51411, IDAHO FALLS, ID 83405-1411
PO BOX 51412, IDAHO FALLS, ID 83405-1412
PO BOX 51413, IDAHO FALLS, ID 83405-1413
PO BOX 51414, IDAHO FALLS, ID 83405-1414
PO BOX 51415, IDAHO FALLS, ID 83405-1415
PO BOX 51416, IDAHO FALLS, ID 83405-1416
PO BOX 51417, IDAHO FALLS, ID 83405-1417
PO BOX 51418, IDAHO FALLS, ID 83405-1418
PO BOX 51419, IDAHO FALLS, ID 83405-1419
PO BOX 51420, IDAHO FALLS, ID 83405-1420
PO BOX 51421, IDAHO FALLS, ID 83405-1421
PO BOX 51422, IDAHO FALLS, ID 83405-1422
PO BOX 51423, IDAHO FALLS, ID 83405-1423
PO BOX 51424, IDAHO FALLS, ID 83405-1424
PO BOX 51425, IDAHO FALLS, ID 83405-1425
PO BOX 51426, IDAHO FALLS, ID 83405-1426
PO BOX 51427, IDAHO FALLS, ID 83405-1427
PO BOX 51428, IDAHO FALLS, ID 83405-1428
PO BOX 51429, IDAHO FALLS, ID 83405-1429
PO BOX 51430, IDAHO FALLS, ID 83405-1430
PO BOX 51431, IDAHO FALLS, ID 83405-1431
PO BOX 51432, IDAHO FALLS, ID 83405-1432
PO BOX 51433, IDAHO FALLS, ID 83405-1433
PO BOX 51434, IDAHO FALLS, ID 83405-1434
PO BOX 51435, IDAHO FALLS, ID 83405-1435
PO BOX 51436, IDAHO FALLS, ID 83405-1436
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