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 1301, SPRING VALLEY, CA 91979-1301
PO BOX 1302, SPRING VALLEY, CA 91979-1302
PO BOX 1303, SPRING VALLEY, CA 91979-1303
PO BOX 1304, SPRING VALLEY, CA 91979-1304
PO BOX 1305, SPRING VALLEY, CA 91979-1305
PO BOX 1306, SPRING VALLEY, CA 91979-1306
PO BOX 1307, SPRING VALLEY, CA 91979-1307
PO BOX 1308, SPRING VALLEY, CA 91979-1308
PO BOX 1309, SPRING VALLEY, CA 91979-1309
PO BOX 1310, SPRING VALLEY, CA 91979-1310
PO BOX 1311, SPRING VALLEY, CA 91979-1311
PO BOX 1312, SPRING VALLEY, CA 91979-1312
PO BOX 1313, SPRING VALLEY, CA 91979-1313
PO BOX 1314, SPRING VALLEY, CA 91979-1314
PO BOX 1315, SPRING VALLEY, CA 91979-1315
PO BOX 1316, SPRING VALLEY, CA 91979-1316
PO BOX 1317, SPRING VALLEY, CA 91979-1317
PO BOX 1318, SPRING VALLEY, CA 91979-1318
PO BOX 1319, SPRING VALLEY, CA 91979-1319
PO BOX 1320, SPRING VALLEY, CA 91979-1320
PO BOX 1321, SPRING VALLEY, CA 91979-1321
PO BOX 1322, SPRING VALLEY, CA 91979-1322
PO BOX 1323, SPRING VALLEY, CA 91979-1323
PO BOX 1324, SPRING VALLEY, CA 91979-1324
PO BOX 1325, SPRING VALLEY, CA 91979-1325
PO BOX 1326, SPRING VALLEY, CA 91979-1326
PO BOX 1327, SPRING VALLEY, CA 91979-1327
PO BOX 1328, SPRING VALLEY, CA 91979-1328
PO BOX 1329, SPRING VALLEY, CA 91979-1329
PO BOX 1330, SPRING VALLEY, CA 91979-1330
PO BOX 1331, SPRING VALLEY, CA 91979-1331
PO BOX 1332, SPRING VALLEY, CA 91979-1332
PO BOX 1333, SPRING VALLEY, CA 91979-1333
PO BOX 1334, SPRING VALLEY, CA 91979-1334
PO BOX 1335, SPRING VALLEY, CA 91979-1335
PO BOX 1336, SPRING VALLEY, CA 91979-1336
PO BOX 1337, SPRING VALLEY, CA 91979-1337
PO BOX 1338, SPRING VALLEY, CA 91979-1338
PO BOX 1339, SPRING VALLEY, CA 91979-1339
PO BOX 1340, SPRING VALLEY, CA 91979-1340
PO BOX 1341, SPRING VALLEY, CA 91979-1341
PO BOX 1342, SPRING VALLEY, CA 91979-1342
PO BOX 1343, SPRING VALLEY, CA 91979-1343
PO BOX 1344, SPRING VALLEY, CA 91979-1344
PO BOX 1345, SPRING VALLEY, CA 91979-1345
PO BOX 1346, SPRING VALLEY, CA 91979-1346
PO BOX 1347, SPRING VALLEY, CA 91979-1347
PO BOX 1348, SPRING VALLEY, CA 91979-1348
PO BOX 1349, SPRING VALLEY, CA 91979-1349
PO BOX 1350, SPRING VALLEY, CA 91979-1350
PO BOX 1351, SPRING VALLEY, CA 91979-1351
PO BOX 1352, SPRING VALLEY, CA 91979-1352
PO BOX 1353, SPRING VALLEY, CA 91979-1353
PO BOX 1354, SPRING VALLEY, CA 91979-1354
PO BOX 1355, SPRING VALLEY, CA 91979-1355
PO BOX 1356, SPRING VALLEY, CA 91979-1356
PO BOX 1357, SPRING VALLEY, CA 91979-1357
PO BOX 1358, SPRING VALLEY, CA 91979-1358
PO BOX 1359, SPRING VALLEY, CA 91979-1359
PO BOX 1360, SPRING VALLEY, CA 91979-1360
PO BOX 1361, SPRING VALLEY, CA 91979-1361
PO BOX 1362, SPRING VALLEY, CA 91979-1362
PO BOX 1363, SPRING VALLEY, CA 91979-1363
PO BOX 1364, SPRING VALLEY, CA 91979-1364
PO BOX 1365, SPRING VALLEY, CA 91979-1365
PO BOX 1366, SPRING VALLEY, CA 91979-1366
PO BOX 1367, SPRING VALLEY, CA 91979-1367
PO BOX 1368, SPRING VALLEY, CA 91979-1368
PO BOX 1369, SPRING VALLEY, CA 91979-1369
PO BOX 1370, SPRING VALLEY, CA 91979-1370
PO BOX 1371, SPRING VALLEY, CA 91979-1371
PO BOX 1372, SPRING VALLEY, CA 91979-1372
PO BOX 1373, SPRING VALLEY, CA 91979-1373
PO BOX 1374, SPRING VALLEY, CA 91979-1374
PO BOX 1375, SPRING VALLEY, CA 91979-1375
PO BOX 1376, SPRING VALLEY, CA 91979-1376
PO BOX 1377, SPRING VALLEY, CA 91979-1377
PO BOX 1378, SPRING VALLEY, CA 91979-1378
PO BOX 1379, SPRING VALLEY, CA 91979-1379
PO BOX 1380, SPRING VALLEY, CA 91979-1380
PO BOX 1381, SPRING VALLEY, CA 91979-1381
PO BOX 1382, SPRING VALLEY, CA 91979-1382
PO BOX 1383, SPRING VALLEY, CA 91979-1383
PO BOX 1384, SPRING VALLEY, CA 91979-1384
PO BOX 1385, SPRING VALLEY, CA 91979-1385
PO BOX 1386, SPRING VALLEY, CA 91979-1386
PO BOX 1387, SPRING VALLEY, CA 91979-1387
PO BOX 1388, SPRING VALLEY, CA 91979-1388
PO BOX 1389, SPRING VALLEY, CA 91979-1389
PO BOX 1390, SPRING VALLEY, CA 91979-1390
PO BOX 1391, SPRING VALLEY, CA 91979-1391
PO BOX 1392, SPRING VALLEY, CA 91979-1392
PO BOX 1393, SPRING VALLEY, CA 91979-1393
PO BOX 1394, SPRING VALLEY, CA 91979-1394
PO BOX 1395, SPRING VALLEY, CA 91979-1395
PO BOX 1396, SPRING VALLEY, CA 91979-1396
PO BOX 1397, SPRING VALLEY, CA 91979-1397
PO BOX 1398, SPRING VALLEY, CA 91979-1398
PO BOX 1399, SPRING VALLEY, CA 91979-1399
PO BOX 1400, SPRING VALLEY, CA 91979-1400
PO BOX 1401, SPRING VALLEY, CA 91979-1401
PO BOX 1402, SPRING VALLEY, CA 91979-1402
PO BOX 1403, SPRING VALLEY, CA 91979-1403
PO BOX 1404, SPRING VALLEY, CA 91979-1404
PO BOX 1405, SPRING VALLEY, CA 91979-1405
PO BOX 1406, SPRING VALLEY, CA 91979-1406
PO BOX 1407, SPRING VALLEY, CA 91979-1407
PO BOX 1408, SPRING VALLEY, CA 91979-1408
PO BOX 1409, SPRING VALLEY, CA 91979-1409
PO BOX 1410, SPRING VALLEY, CA 91979-1410
PO BOX 1411, SPRING VALLEY, CA 91979-1411
PO BOX 1412, SPRING VALLEY, CA 91979-1412
PO BOX 1413, SPRING VALLEY, CA 91979-1413
PO BOX 1414, SPRING VALLEY, CA 91979-1414
PO BOX 1415, SPRING VALLEY, CA 91979-1415
PO BOX 1416, SPRING VALLEY, CA 91979-1416
PO BOX 1417, SPRING VALLEY, CA 91979-1417
PO BOX 1418, SPRING VALLEY, CA 91979-1418
PO BOX 1419, SPRING VALLEY, CA 91979-1419
PO BOX 1420, SPRING VALLEY, CA 91979-1420
PO BOX 1421, SPRING VALLEY, CA 91979-1421
PO BOX 1422, SPRING VALLEY, CA 91979-1422
PO BOX 1423, SPRING VALLEY, CA 91979-1423
PO BOX 1424, SPRING VALLEY, CA 91979-1424
PO BOX 1425, SPRING VALLEY, CA 91979-1425
PO BOX 1426, SPRING VALLEY, CA 91979-1426
PO BOX 1427, SPRING VALLEY, CA 91979-1427
PO BOX 1428, SPRING VALLEY, CA 91979-1428
PO BOX 1429, SPRING VALLEY, CA 91979-1429
PO BOX 1430, SPRING VALLEY, CA 91979-1430
PO BOX 1431, SPRING VALLEY, CA 91979-1431
PO BOX 1432, SPRING VALLEY, CA 91979-1432
PO BOX 1433, SPRING VALLEY, CA 91979-1433
PO BOX 1434, SPRING VALLEY, CA 91979-1434
PO BOX 1435, SPRING VALLEY, CA 91979-1435
PO BOX 1436, SPRING VALLEY, CA 91979-1436
PO BOX 1437, SPRING VALLEY, CA 91979-1437
PO BOX 1438, SPRING VALLEY, CA 91979-1438
PO BOX 1439, SPRING VALLEY, CA 91979-1439
PO BOX 1440, SPRING VALLEY, CA 91979-1440
PO BOX 1441, SPRING VALLEY, CA 91979-1441
PO BOX 1442, SPRING VALLEY, CA 91979-1442
PO BOX 1443, SPRING VALLEY, CA 91979-1443
PO BOX 1444, SPRING VALLEY, CA 91979-1444
PO BOX 1445, SPRING VALLEY, CA 91979-1445
PO BOX 1446, SPRING VALLEY, CA 91979-1446
PO BOX 1447, SPRING VALLEY, CA 91979-1447
PO BOX 1448, SPRING VALLEY, CA 91979-1448
PO BOX 1449, SPRING VALLEY, CA 91979-1449
PO BOX 1450, SPRING VALLEY, CA 91979-1450
PO BOX 1451, SPRING VALLEY, CA 91979-1451
PO BOX 1452, SPRING VALLEY, CA 91979-1452
PO BOX 1453, SPRING VALLEY, CA 91979-1453
PO BOX 1454, SPRING VALLEY, CA 91979-1454
PO BOX 1455, SPRING VALLEY, CA 91979-1455
PO BOX 1456, SPRING VALLEY, CA 91979-1456
PO BOX 1457, SPRING VALLEY, CA 91979-1457
PO BOX 1458, SPRING VALLEY, CA 91979-1458
PO BOX 1459, SPRING VALLEY, CA 91979-1459
PO BOX 1460, SPRING VALLEY, CA 91979-1460
PO BOX 1461, SPRING VALLEY, CA 91979-1461
PO BOX 1462, SPRING VALLEY, CA 91979-1462
PO BOX 1463, SPRING VALLEY, CA 91979-1463
PO BOX 1464, SPRING VALLEY, CA 91979-1464
PO BOX 1465, SPRING VALLEY, CA 91979-1465
PO BOX 1466, SPRING VALLEY, CA 91979-1466
PO BOX 1467, SPRING VALLEY, CA 91979-1467
PO BOX 1468, SPRING VALLEY, CA 91979-1468
PO BOX 1469, SPRING VALLEY, CA 91979-1469
PO BOX 1470, SPRING VALLEY, CA 91979-1470
PO BOX 1471, SPRING VALLEY, CA 91979-1471
PO BOX 1472, SPRING VALLEY, CA 91979-1472
PO BOX 1473, SPRING VALLEY, CA 91979-1473
PO BOX 1474, SPRING VALLEY, CA 91979-1474
PO BOX 1475, SPRING VALLEY, CA 91979-1475
PO BOX 1476, SPRING VALLEY, CA 91979-1476
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