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 1261, IMPERIAL BEACH, CA 91933-1261
PO BOX 1262, IMPERIAL BEACH, CA 91933-1262
PO BOX 1263, IMPERIAL BEACH, CA 91933-1263
PO BOX 1264, IMPERIAL BEACH, CA 91933-1264
PO BOX 1265, IMPERIAL BEACH, CA 91933-1265
PO BOX 1266, IMPERIAL BEACH, CA 91933-1266
PO BOX 1267, IMPERIAL BEACH, CA 91933-1267
PO BOX 1268, IMPERIAL BEACH, CA 91933-1268
PO BOX 1269, IMPERIAL BEACH, CA 91933-1269
PO BOX 1270, IMPERIAL BEACH, CA 91933-1270
PO BOX 1271, IMPERIAL BEACH, CA 91933-1271
PO BOX 1272, IMPERIAL BEACH, CA 91933-1272
PO BOX 1273, IMPERIAL BEACH, CA 91933-1273
PO BOX 1274, IMPERIAL BEACH, CA 91933-1274
PO BOX 1275, IMPERIAL BEACH, CA 91933-1275
PO BOX 1276, IMPERIAL BEACH, CA 91933-1276
PO BOX 1277, IMPERIAL BEACH, CA 91933-1277
PO BOX 1278, IMPERIAL BEACH, CA 91933-1278
PO BOX 1279, IMPERIAL BEACH, CA 91933-1279
PO BOX 1280, IMPERIAL BEACH, CA 91933-1280
PO BOX 1281, IMPERIAL BEACH, CA 91933-1281
PO BOX 1282, IMPERIAL BEACH, CA 91933-1282
PO BOX 1283, IMPERIAL BEACH, CA 91933-1283
PO BOX 1284, IMPERIAL BEACH, CA 91933-1284
PO BOX 1285, IMPERIAL BEACH, CA 91933-1285
PO BOX 1286, IMPERIAL BEACH, CA 91933-1286
PO BOX 1287, IMPERIAL BEACH, CA 91933-1287
PO BOX 1288, IMPERIAL BEACH, CA 91933-1288
PO BOX 1289, IMPERIAL BEACH, CA 91933-1289
PO BOX 1290, IMPERIAL BEACH, CA 91933-1290
PO BOX 1291, IMPERIAL BEACH, CA 91933-1291
PO BOX 1292, IMPERIAL BEACH, CA 91933-1292
PO BOX 1293, IMPERIAL BEACH, CA 91933-1293
PO BOX 1294, IMPERIAL BEACH, CA 91933-1294
PO BOX 1295, IMPERIAL BEACH, CA 91933-1295
PO BOX 1296, IMPERIAL BEACH, CA 91933-1296
PO BOX 1297, IMPERIAL BEACH, CA 91933-1297
PO BOX 1298, IMPERIAL BEACH, CA 91933-1298
PO BOX 1299, IMPERIAL BEACH, CA 91933-1299
PO BOX 1300, IMPERIAL BEACH, CA 91933-1300
PO BOX 1301, IMPERIAL BEACH, CA 91933-1301
PO BOX 1302, IMPERIAL BEACH, CA 91933-1302
PO BOX 1303, IMPERIAL BEACH, CA 91933-1303
PO BOX 1304, IMPERIAL BEACH, CA 91933-1304
PO BOX 1305, IMPERIAL BEACH, CA 91933-1305
PO BOX 1306, IMPERIAL BEACH, CA 91933-1306
PO BOX 1307, IMPERIAL BEACH, CA 91933-1307
PO BOX 1308, IMPERIAL BEACH, CA 91933-1308
PO BOX 1309, IMPERIAL BEACH, CA 91933-1309
PO BOX 1310, IMPERIAL BEACH, CA 91933-1310
PO BOX 1311, IMPERIAL BEACH, CA 91933-1311
PO BOX 1312, IMPERIAL BEACH, CA 91933-1312
PO BOX 1313, IMPERIAL BEACH, CA 91933-1313
PO BOX 1314, IMPERIAL BEACH, CA 91933-1314
PO BOX 1315, IMPERIAL BEACH, CA 91933-1315
PO BOX 1316, IMPERIAL BEACH, CA 91933-1316
PO BOX 1317, IMPERIAL BEACH, CA 91933-1317
PO BOX 1318, IMPERIAL BEACH, CA 91933-1318
PO BOX 1319, IMPERIAL BEACH, CA 91933-1319
PO BOX 1320, IMPERIAL BEACH, CA 91933-1320
PO BOX 1321, IMPERIAL BEACH, CA 91933-1321
PO BOX 1322, IMPERIAL BEACH, CA 91933-1322
PO BOX 1323, IMPERIAL BEACH, CA 91933-1323
PO BOX 1324, IMPERIAL BEACH, CA 91933-1324
PO BOX 1325, IMPERIAL BEACH, CA 91933-1325
PO BOX 1326, IMPERIAL BEACH, CA 91933-1326
PO BOX 1327, IMPERIAL BEACH, CA 91933-1327
PO BOX 1328, IMPERIAL BEACH, CA 91933-1328
PO BOX 1329, IMPERIAL BEACH, CA 91933-1329
PO BOX 1330, IMPERIAL BEACH, CA 91933-1330
PO BOX 1331, IMPERIAL BEACH, CA 91933-1331
PO BOX 1332, IMPERIAL BEACH, CA 91933-1332
PO BOX 1333, IMPERIAL BEACH, CA 91933-1333
PO BOX 1334, IMPERIAL BEACH, CA 91933-1334
PO BOX 1335, IMPERIAL BEACH, CA 91933-1335
PO BOX 1336, IMPERIAL BEACH, CA 91933-1336
PO BOX 1337, IMPERIAL BEACH, CA 91933-1337
PO BOX 1338, IMPERIAL BEACH, CA 91933-1338
PO BOX 1339, IMPERIAL BEACH, CA 91933-1339
PO BOX 1340, IMPERIAL BEACH, CA 91933-1340
PO BOX 1341, IMPERIAL BEACH, CA 91933-1341
PO BOX 1342, IMPERIAL BEACH, CA 91933-1342
PO BOX 1343, IMPERIAL BEACH, CA 91933-1343
PO BOX 1344, IMPERIAL BEACH, CA 91933-1344
PO BOX 1345, IMPERIAL BEACH, CA 91933-1345
PO BOX 1346, IMPERIAL BEACH, CA 91933-1346
PO BOX 1347, IMPERIAL BEACH, CA 91933-1347
PO BOX 1348, IMPERIAL BEACH, CA 91933-1348
PO BOX 1349, IMPERIAL BEACH, CA 91933-1349
PO BOX 1350, IMPERIAL BEACH, CA 91933-1350
PO BOX 1351, IMPERIAL BEACH, CA 91933-1351
PO BOX 1352, IMPERIAL BEACH, CA 91933-1352
PO BOX 1353, IMPERIAL BEACH, CA 91933-1353
PO BOX 1354, IMPERIAL BEACH, CA 91933-1354
PO BOX 1355, IMPERIAL BEACH, CA 91933-1355
PO BOX 1356, IMPERIAL BEACH, CA 91933-1356
PO BOX 1357, IMPERIAL BEACH, CA 91933-1357
PO BOX 1358, IMPERIAL BEACH, CA 91933-1358
PO BOX 1359, IMPERIAL BEACH, CA 91933-1359
PO BOX 1360, IMPERIAL BEACH, CA 91933-1360
PO BOX 1361, IMPERIAL BEACH, CA 91933-1361
PO BOX 1362, IMPERIAL BEACH, CA 91933-1362
PO BOX 1363, IMPERIAL BEACH, CA 91933-1363
PO BOX 1364, IMPERIAL BEACH, CA 91933-1364
PO BOX 1365, IMPERIAL BEACH, CA 91933-1365
PO BOX 1366, IMPERIAL BEACH, CA 91933-1366
PO BOX 1367, IMPERIAL BEACH, CA 91933-1367
PO BOX 1368, IMPERIAL BEACH, CA 91933-1368
PO BOX 1369, IMPERIAL BEACH, CA 91933-1369
PO BOX 1370, IMPERIAL BEACH, CA 91933-1370
PO BOX 1371, IMPERIAL BEACH, CA 91933-1371
PO BOX 1372, IMPERIAL BEACH, CA 91933-1372
PO BOX 1373, IMPERIAL BEACH, CA 91933-1373
PO BOX 1374, IMPERIAL BEACH, CA 91933-1374
PO BOX 1375, IMPERIAL BEACH, CA 91933-1375
PO BOX 1376, IMPERIAL BEACH, CA 91933-1376
PO BOX 1377, IMPERIAL BEACH, CA 91933-1377
PO BOX 1378, IMPERIAL BEACH, CA 91933-1378
PO BOX 1379, IMPERIAL BEACH, CA 91933-1379
PO BOX 1380, IMPERIAL BEACH, CA 91933-1380
PO BOX 1381, IMPERIAL BEACH, CA 91933-1381
PO BOX 1382, IMPERIAL BEACH, CA 91933-1382
PO BOX 1383, IMPERIAL BEACH, CA 91933-1383
PO BOX 1384, IMPERIAL BEACH, CA 91933-1384
PO BOX 1385, IMPERIAL BEACH, CA 91933-1385
PO BOX 1386, IMPERIAL BEACH, CA 91933-1386
PO BOX 1387, IMPERIAL BEACH, CA 91933-1387
PO BOX 1388, IMPERIAL BEACH, CA 91933-1388
PO BOX 1389, IMPERIAL BEACH, CA 91933-1389
PO BOX 1390, IMPERIAL BEACH, CA 91933-1390
PO BOX 1391, IMPERIAL BEACH, CA 91933-1391
PO BOX 1392, IMPERIAL BEACH, CA 91933-1392
PO BOX 1393, IMPERIAL BEACH, CA 91933-1393
PO BOX 1394, IMPERIAL BEACH, CA 91933-1394
PO BOX 1395, IMPERIAL BEACH, CA 91933-1395
PO BOX 1396, IMPERIAL BEACH, CA 91933-1396
PO BOX 1397, IMPERIAL BEACH, CA 91933-1397
PO BOX 1398, IMPERIAL BEACH, CA 91933-1398
PO BOX 1399, IMPERIAL BEACH, CA 91933-1399
PO BOX 1400, IMPERIAL BEACH, CA 91933-1400
PO BOX 1401, IMPERIAL BEACH, CA 91933-1401
PO BOX 1402, IMPERIAL BEACH, CA 91933-1402
PO BOX 1403, IMPERIAL BEACH, CA 91933-1403
PO BOX 1404, IMPERIAL BEACH, CA 91933-1404
PO BOX 1405, IMPERIAL BEACH, CA 91933-1405
PO BOX 1406, IMPERIAL BEACH, CA 91933-1406
PO BOX 1407, IMPERIAL BEACH, CA 91933-1407
PO BOX 1408, IMPERIAL BEACH, CA 91933-1408
PO BOX 1409, IMPERIAL BEACH, CA 91933-1409
PO BOX 1410, IMPERIAL BEACH, CA 91933-1410
PO BOX 1411, IMPERIAL BEACH, CA 91933-1411
PO BOX 1412, IMPERIAL BEACH, CA 91933-1412
PO BOX 1413, IMPERIAL BEACH, CA 91933-1413
PO BOX 1414, IMPERIAL BEACH, CA 91933-1414
PO BOX 1415, IMPERIAL BEACH, CA 91933-1415
PO BOX 1416, IMPERIAL BEACH, CA 91933-1416
PO BOX 1417, IMPERIAL BEACH, CA 91933-1417
PO BOX 1418, IMPERIAL BEACH, CA 91933-1418
PO BOX 1419, IMPERIAL BEACH, CA 91933-1419
PO BOX 1420, IMPERIAL BEACH, CA 91933-1420
PO BOX 1421, IMPERIAL BEACH, CA 91933-1421
PO BOX 1422, IMPERIAL BEACH, CA 91933-1422
PO BOX 1423, IMPERIAL BEACH, CA 91933-1423
PO BOX 1424, IMPERIAL BEACH, CA 91933-1424
PO BOX 1425, IMPERIAL BEACH, CA 91933-1425
PO BOX 1426, IMPERIAL BEACH, CA 91933-1426
PO BOX 1427, IMPERIAL BEACH, CA 91933-1427
PO BOX 1428, IMPERIAL BEACH, CA 91933-1428
PO BOX 1429, IMPERIAL BEACH, CA 91933-1429
PO BOX 1430, IMPERIAL BEACH, CA 91933-1430
PO BOX 1431, IMPERIAL BEACH, CA 91933-1431
PO BOX 1432, IMPERIAL BEACH, CA 91933-1432
PO BOX 1433, IMPERIAL BEACH, CA 91933-1433
PO BOX 1434, IMPERIAL BEACH, CA 91933-1434
PO BOX 1435, IMPERIAL BEACH, CA 91933-1435
PO BOX 1436, IMPERIAL BEACH, CA 91933-1436
PO BOX 1437, IMPERIAL BEACH, CA 91933-1437
PO BOX 1438, IMPERIAL BEACH, CA 91933-1438
PO BOX 1439, IMPERIAL BEACH, CA 91933-1439
PO BOX 1440, IMPERIAL BEACH, CA 91933-1440
PO BOX 1441, IMPERIAL BEACH, CA 91933-1441
PO BOX 1442, IMPERIAL BEACH, CA 91933-1442
PO BOX 1443, IMPERIAL BEACH, CA 91933-1443
PO BOX 1444, IMPERIAL BEACH, CA 91933-1444
PO BOX 1445, IMPERIAL BEACH, CA 91933-1445
PO BOX 1446, IMPERIAL BEACH, CA 91933-1446
PO BOX 1447, IMPERIAL BEACH, CA 91933-1447
PO BOX 1448, IMPERIAL BEACH, CA 91933-1448
PO BOX 1449, IMPERIAL BEACH, CA 91933-1449
PO BOX 1450, IMPERIAL BEACH, CA 91933-1450
PO BOX 1451, IMPERIAL BEACH, CA 91933-1451
PO BOX 1452, IMPERIAL BEACH, CA 91933-1452
PO BOX 1453, IMPERIAL BEACH, CA 91933-1453
PO BOX 1454, IMPERIAL BEACH, CA 91933-1454
PO BOX 1455, IMPERIAL BEACH, CA 91933-1455
PO BOX 1456, IMPERIAL BEACH, CA 91933-1456
PO BOX 1457, IMPERIAL BEACH, CA 91933-1457
PO BOX 1458, IMPERIAL BEACH, CA 91933-1458
PO BOX 1459, IMPERIAL BEACH, CA 91933-1459
PO BOX 1460, IMPERIAL BEACH, CA 91933-1460
PO BOX 1461, IMPERIAL BEACH, CA 91933-1461
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