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 1241, PORTERVILLE, CA 93258-1241
PO BOX 1242, PORTERVILLE, CA 93258-1242
PO BOX 1243, PORTERVILLE, CA 93258-1243
PO BOX 1244, PORTERVILLE, CA 93258-1244
PO BOX 1245, PORTERVILLE, CA 93258-1245
PO BOX 1246, PORTERVILLE, CA 93258-1246
PO BOX 1247, PORTERVILLE, CA 93258-1247
PO BOX 1248, PORTERVILLE, CA 93258-1248
PO BOX 1249, PORTERVILLE, CA 93258-1249
PO BOX 1250, PORTERVILLE, CA 93258-1250
PO BOX 1251, PORTERVILLE, CA 93258-1251
PO BOX 1252, PORTERVILLE, CA 93258-1252
PO BOX 1253, PORTERVILLE, CA 93258-1253
PO BOX 1254, PORTERVILLE, CA 93258-1254
PO BOX 1255, PORTERVILLE, CA 93258-1255
PO BOX 1256, PORTERVILLE, CA 93258-1256
PO BOX 1257, PORTERVILLE, CA 93258-1257
PO BOX 1258, PORTERVILLE, CA 93258-1258
PO BOX 1259, PORTERVILLE, CA 93258-1259
PO BOX 1260, PORTERVILLE, CA 93258-1260
PO BOX 1261, PORTERVILLE, CA 93258-1261
PO BOX 1262, PORTERVILLE, CA 93258-1262
PO BOX 1263, PORTERVILLE, CA 93258-1263
PO BOX 1264, PORTERVILLE, CA 93258-1264
PO BOX 1265, PORTERVILLE, CA 93258-1265
PO BOX 1266, PORTERVILLE, CA 93258-1266
PO BOX 1267, PORTERVILLE, CA 93258-1267
PO BOX 1268, PORTERVILLE, CA 93258-1268
PO BOX 1269, PORTERVILLE, CA 93258-1269
PO BOX 1270, PORTERVILLE, CA 93258-1270
PO BOX 1271, PORTERVILLE, CA 93258-1271
PO BOX 1272, PORTERVILLE, CA 93258-1272
PO BOX 1273, PORTERVILLE, CA 93258-1273
PO BOX 1274, PORTERVILLE, CA 93258-1274
PO BOX 1275, PORTERVILLE, CA 93258-1275
PO BOX 1276, PORTERVILLE, CA 93258-1276
PO BOX 1277, PORTERVILLE, CA 93258-1277
PO BOX 1278, PORTERVILLE, CA 93258-1278
PO BOX 1279, PORTERVILLE, CA 93258-1279
PO BOX 1280, PORTERVILLE, CA 93258-1280
PO BOX 1281, PORTERVILLE, CA 93258-1281
PO BOX 1282, PORTERVILLE, CA 93258-1282
PO BOX 1283, PORTERVILLE, CA 93258-1283
PO BOX 1284, PORTERVILLE, CA 93258-1284
PO BOX 1285, PORTERVILLE, CA 93258-1285
PO BOX 1286, PORTERVILLE, CA 93258-1286
PO BOX 1287, PORTERVILLE, CA 93258-1287
PO BOX 1288, PORTERVILLE, CA 93258-1288
PO BOX 1289, PORTERVILLE, CA 93258-1289
PO BOX 1290, PORTERVILLE, CA 93258-1290
PO BOX 1291, PORTERVILLE, CA 93258-1291
PO BOX 1292, PORTERVILLE, CA 93258-1292
PO BOX 1293, PORTERVILLE, CA 93258-1293
PO BOX 1294, PORTERVILLE, CA 93258-1294
PO BOX 1295, PORTERVILLE, CA 93258-1295
PO BOX 1296, PORTERVILLE, CA 93258-1296
PO BOX 1297, PORTERVILLE, CA 93258-1297
PO BOX 1298, PORTERVILLE, CA 93258-1298
PO BOX 1299, PORTERVILLE, CA 93258-1299
PO BOX 1300, PORTERVILLE, CA 93258-1300
PO BOX 1301, PORTERVILLE, CA 93258-1301
PO BOX 1302, PORTERVILLE, CA 93258-1302
PO BOX 1303, PORTERVILLE, CA 93258-1303
PO BOX 1304, PORTERVILLE, CA 93258-1304
PO BOX 1305, PORTERVILLE, CA 93258-1305
PO BOX 1306, PORTERVILLE, CA 93258-1306
PO BOX 1307, PORTERVILLE, CA 93258-1307
PO BOX 1308, PORTERVILLE, CA 93258-1308
PO BOX 1309, PORTERVILLE, CA 93258-1309
PO BOX 1310, PORTERVILLE, CA 93258-1310
PO BOX 1311, PORTERVILLE, CA 93258-1311
PO BOX 1312, PORTERVILLE, CA 93258-1312
PO BOX 1313, PORTERVILLE, CA 93258-1313
PO BOX 1314, PORTERVILLE, CA 93258-1314
PO BOX 1315, PORTERVILLE, CA 93258-1315
PO BOX 1316, PORTERVILLE, CA 93258-1316
PO BOX 1317, PORTERVILLE, CA 93258-1317
PO BOX 1318, PORTERVILLE, CA 93258-1318
PO BOX 1319, PORTERVILLE, CA 93258-1319
PO BOX 1320, PORTERVILLE, CA 93258-1320
PO BOX 1321, PORTERVILLE, CA 93258-1321
PO BOX 1322, PORTERVILLE, CA 93258-1322
PO BOX 1323, PORTERVILLE, CA 93258-1323
PO BOX 1324, PORTERVILLE, CA 93258-1324
PO BOX 1325, PORTERVILLE, CA 93258-1325
PO BOX 1326, PORTERVILLE, CA 93258-1326
PO BOX 1327, PORTERVILLE, CA 93258-1327
PO BOX 1328, PORTERVILLE, CA 93258-1328
PO BOX 1329, PORTERVILLE, CA 93258-1329
PO BOX 1330, PORTERVILLE, CA 93258-1330
PO BOX 1331, PORTERVILLE, CA 93258-1331
PO BOX 1332, PORTERVILLE, CA 93258-1332
PO BOX 1333, PORTERVILLE, CA 93258-1333
PO BOX 1334, PORTERVILLE, CA 93258-1334
PO BOX 1335, PORTERVILLE, CA 93258-1335
PO BOX 1336, PORTERVILLE, CA 93258-1336
PO BOX 1337, PORTERVILLE, CA 93258-1337
PO BOX 1338, PORTERVILLE, CA 93258-1338
PO BOX 1339, PORTERVILLE, CA 93258-1339
PO BOX 1340, PORTERVILLE, CA 93258-1340
PO BOX 1341, PORTERVILLE, CA 93258-1341
PO BOX 1342, PORTERVILLE, CA 93258-1342
PO BOX 1343, PORTERVILLE, CA 93258-1343
PO BOX 1344, PORTERVILLE, CA 93258-1344
PO BOX 1345, PORTERVILLE, CA 93258-1345
PO BOX 1346, PORTERVILLE, CA 93258-1346
PO BOX 1347, PORTERVILLE, CA 93258-1347
PO BOX 1348, PORTERVILLE, CA 93258-1348
PO BOX 1349, PORTERVILLE, CA 93258-1349
PO BOX 1350, PORTERVILLE, CA 93258-1350
PO BOX 1351, PORTERVILLE, CA 93258-1351
PO BOX 1352, PORTERVILLE, CA 93258-1352
PO BOX 1353, PORTERVILLE, CA 93258-1353
PO BOX 1354, PORTERVILLE, CA 93258-1354
PO BOX 1355, PORTERVILLE, CA 93258-1355
PO BOX 1356, PORTERVILLE, CA 93258-1356
PO BOX 1357, PORTERVILLE, CA 93258-1357
PO BOX 1358, PORTERVILLE, CA 93258-1358
PO BOX 1359, PORTERVILLE, CA 93258-1359
PO BOX 1360, PORTERVILLE, CA 93258-1360
PO BOX 1361, PORTERVILLE, CA 93258-1361
PO BOX 1362, PORTERVILLE, CA 93258-1362
PO BOX 1363, PORTERVILLE, CA 93258-1363
PO BOX 1364, PORTERVILLE, CA 93258-1364
PO BOX 1365, PORTERVILLE, CA 93258-1365
PO BOX 1366, PORTERVILLE, CA 93258-1366
PO BOX 1367, PORTERVILLE, CA 93258-1367
PO BOX 1368, PORTERVILLE, CA 93258-1368
PO BOX 1369, PORTERVILLE, CA 93258-1369
PO BOX 1370, PORTERVILLE, CA 93258-1370
PO BOX 1371, PORTERVILLE, CA 93258-1371
PO BOX 1372, PORTERVILLE, CA 93258-1372
PO BOX 1373, PORTERVILLE, CA 93258-1373
PO BOX 1374, PORTERVILLE, CA 93258-1374
PO BOX 1375, PORTERVILLE, CA 93258-1375
PO BOX 1376, PORTERVILLE, CA 93258-1376
PO BOX 1377, PORTERVILLE, CA 93258-1377
PO BOX 1378, PORTERVILLE, CA 93258-1378
PO BOX 1379, PORTERVILLE, CA 93258-1379
PO BOX 1380, PORTERVILLE, CA 93258-1380
PO BOX 1381, PORTERVILLE, CA 93258-1381
PO BOX 1382, PORTERVILLE, CA 93258-1382
PO BOX 1383, PORTERVILLE, CA 93258-1383
PO BOX 1384, PORTERVILLE, CA 93258-1384
PO BOX 1385, PORTERVILLE, CA 93258-1385
PO BOX 1386, PORTERVILLE, CA 93258-1386
PO BOX 1387, PORTERVILLE, CA 93258-1387
PO BOX 1388, PORTERVILLE, CA 93258-1388
PO BOX 1389, PORTERVILLE, CA 93258-1389
PO BOX 1390, PORTERVILLE, CA 93258-1390
PO BOX 1391, PORTERVILLE, CA 93258-1391
PO BOX 1392, PORTERVILLE, CA 93258-1392
PO BOX 1393, PORTERVILLE, CA 93258-1393
PO BOX 1394, PORTERVILLE, CA 93258-1394
PO BOX 1395, PORTERVILLE, CA 93258-1395
PO BOX 1396, PORTERVILLE, CA 93258-1396
PO BOX 1397, PORTERVILLE, CA 93258-1397
PO BOX 1398, PORTERVILLE, CA 93258-1398
PO BOX 1399, PORTERVILLE, CA 93258-1399
PO BOX 1400, PORTERVILLE, CA 93258-1400
PO BOX 1401, PORTERVILLE, CA 93258-1401
PO BOX 1402, PORTERVILLE, CA 93258-1402
PO BOX 1403, PORTERVILLE, CA 93258-1403
PO BOX 1404, PORTERVILLE, CA 93258-1404
PO BOX 1405, PORTERVILLE, CA 93258-1405
PO BOX 1406, PORTERVILLE, CA 93258-1406
PO BOX 1407, PORTERVILLE, CA 93258-1407
PO BOX 1408, PORTERVILLE, CA 93258-1408
PO BOX 1409, PORTERVILLE, CA 93258-1409
PO BOX 1410, PORTERVILLE, CA 93258-1410
PO BOX 1411, PORTERVILLE, CA 93258-1411
PO BOX 1412, PORTERVILLE, CA 93258-1412
PO BOX 1413, PORTERVILLE, CA 93258-1413
PO BOX 1414, PORTERVILLE, CA 93258-1414
PO BOX 1415, PORTERVILLE, CA 93258-1415
PO BOX 1416, PORTERVILLE, CA 93258-1416
PO BOX 1417, PORTERVILLE, CA 93258-1417
PO BOX 1418, PORTERVILLE, CA 93258-1418
PO BOX 1419, PORTERVILLE, CA 93258-1419
PO BOX 1420, PORTERVILLE, CA 93258-1420
PO BOX 1421, PORTERVILLE, CA 93258-1421
PO BOX 1422, PORTERVILLE, CA 93258-1422
PO BOX 1423, PORTERVILLE, CA 93258-1423
PO BOX 1424, PORTERVILLE, CA 93258-1424
PO BOX 1425, PORTERVILLE, CA 93258-1425
PO BOX 1426, PORTERVILLE, CA 93258-1426
PO BOX 1427, PORTERVILLE, CA 93258-1427
PO BOX 1428, PORTERVILLE, CA 93258-1428
PO BOX 1429, PORTERVILLE, CA 93258-1429
PO BOX 1430, PORTERVILLE, CA 93258-1430
PO BOX 1431, PORTERVILLE, CA 93258-1431
PO BOX 1432, PORTERVILLE, CA 93258-1432
PO BOX 1433, PORTERVILLE, CA 93258-1433
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