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 1311, SAINT PETERSBURG, FL 33731-1311
PO BOX 1312, SAINT PETERSBURG, FL 33731-1312
PO BOX 1313, SAINT PETERSBURG, FL 33731-1313
PO BOX 1314, SAINT PETERSBURG, FL 33731-1314
PO BOX 1315, SAINT PETERSBURG, FL 33731-1315
PO BOX 1316, SAINT PETERSBURG, FL 33731-1316
PO BOX 1317, SAINT PETERSBURG, FL 33731-1317
PO BOX 1318, SAINT PETERSBURG, FL 33731-1318
PO BOX 1319, SAINT PETERSBURG, FL 33731-1319
PO BOX 1320, SAINT PETERSBURG, FL 33731-1320
PO BOX 1321, SAINT PETERSBURG, FL 33731-1321
PO BOX 1322, SAINT PETERSBURG, FL 33731-1322
PO BOX 1323, SAINT PETERSBURG, FL 33731-1323
PO BOX 1324, SAINT PETERSBURG, FL 33731-1324
PO BOX 1325, SAINT PETERSBURG, FL 33731-1325
PO BOX 1326, SAINT PETERSBURG, FL 33731-1326
PO BOX 1327, SAINT PETERSBURG, FL 33731-1327
PO BOX 1328, SAINT PETERSBURG, FL 33731-1328
PO BOX 1329, SAINT PETERSBURG, FL 33731-1329
PO BOX 1330, SAINT PETERSBURG, FL 33731-1330
PO BOX 1331, SAINT PETERSBURG, FL 33731-1331
PO BOX 1332, SAINT PETERSBURG, FL 33731-1332
PO BOX 1333, SAINT PETERSBURG, FL 33731-1333
PO BOX 1334, SAINT PETERSBURG, FL 33731-1334
PO BOX 1335, SAINT PETERSBURG, FL 33731-1335
PO BOX 1336, SAINT PETERSBURG, FL 33731-1336
PO BOX 1337, SAINT PETERSBURG, FL 33731-1337
PO BOX 1338, SAINT PETERSBURG, FL 33731-1338
PO BOX 1339, SAINT PETERSBURG, FL 33731-1339
PO BOX 1340, SAINT PETERSBURG, FL 33731-1340
PO BOX 1341, SAINT PETERSBURG, FL 33731-1341
PO BOX 1342, SAINT PETERSBURG, FL 33731-1342
PO BOX 1343, SAINT PETERSBURG, FL 33731-1343
PO BOX 1344, SAINT PETERSBURG, FL 33731-1344
PO BOX 1345, SAINT PETERSBURG, FL 33731-1345
PO BOX 1346, SAINT PETERSBURG, FL 33731-1346
PO BOX 1347, SAINT PETERSBURG, FL 33731-1347
PO BOX 1348, SAINT PETERSBURG, FL 33731-1348
PO BOX 1349, SAINT PETERSBURG, FL 33731-1349
PO BOX 1350, SAINT PETERSBURG, FL 33731-1350
PO BOX 1351, SAINT PETERSBURG, FL 33731-1351
PO BOX 1352, SAINT PETERSBURG, FL 33731-1352
PO BOX 1353, SAINT PETERSBURG, FL 33731-1353
PO BOX 1354, SAINT PETERSBURG, FL 33731-1354
PO BOX 1355, SAINT PETERSBURG, FL 33731-1355
PO BOX 1356, SAINT PETERSBURG, FL 33731-1356
PO BOX 1357, SAINT PETERSBURG, FL 33731-1357
PO BOX 1358, SAINT PETERSBURG, FL 33731-1358
PO BOX 1359, SAINT PETERSBURG, FL 33731-1359
PO BOX 1360, SAINT PETERSBURG, FL 33731-1360
PO BOX 1361, SAINT PETERSBURG, FL 33731-1361
PO BOX 1362, SAINT PETERSBURG, FL 33731-1362
PO BOX 1363, SAINT PETERSBURG, FL 33731-1363
PO BOX 1364, SAINT PETERSBURG, FL 33731-1364
PO BOX 1365, SAINT PETERSBURG, FL 33731-1365
PO BOX 1366, SAINT PETERSBURG, FL 33731-1366
PO BOX 1367, SAINT PETERSBURG, FL 33731-1367
PO BOX 1368, SAINT PETERSBURG, FL 33731-1368
PO BOX 1369, SAINT PETERSBURG, FL 33731-1369
PO BOX 1370, SAINT PETERSBURG, FL 33731-1370
PO BOX 1371, SAINT PETERSBURG, FL 33731-1371
PO BOX 1372, SAINT PETERSBURG, FL 33731-1372
PO BOX 1373, SAINT PETERSBURG, FL 33731-1373
PO BOX 1374, SAINT PETERSBURG, FL 33731-1374
PO BOX 1375, SAINT PETERSBURG, FL 33731-1375
PO BOX 1376, SAINT PETERSBURG, FL 33731-1376
PO BOX 1377, SAINT PETERSBURG, FL 33731-1377
PO BOX 1378, SAINT PETERSBURG, FL 33731-1378
PO BOX 1379, SAINT PETERSBURG, FL 33731-1379
PO BOX 1380, SAINT PETERSBURG, FL 33731-1380
PO BOX 1381, SAINT PETERSBURG, FL 33731-1381
PO BOX 1382, SAINT PETERSBURG, FL 33731-1382
PO BOX 1383, SAINT PETERSBURG, FL 33731-1383
PO BOX 1384, SAINT PETERSBURG, FL 33731-1384
PO BOX 1385, SAINT PETERSBURG, FL 33731-1385
PO BOX 1386, SAINT PETERSBURG, FL 33731-1386
PO BOX 1387, SAINT PETERSBURG, FL 33731-1387
PO BOX 1388, SAINT PETERSBURG, FL 33731-1388
PO BOX 1389, SAINT PETERSBURG, FL 33731-1389
PO BOX 1390, SAINT PETERSBURG, FL 33731-1390
PO BOX 1391, SAINT PETERSBURG, FL 33731-1391
PO BOX 1392, SAINT PETERSBURG, FL 33731-1392
PO BOX 1393, SAINT PETERSBURG, FL 33731-1393
PO BOX 1394, SAINT PETERSBURG, FL 33731-1394
PO BOX 1395, SAINT PETERSBURG, FL 33731-1395
PO BOX 1396, SAINT PETERSBURG, FL 33731-1396
PO BOX 1397, SAINT PETERSBURG, FL 33731-1397
PO BOX 1398, SAINT PETERSBURG, FL 33731-1398
PO BOX 1399, SAINT PETERSBURG, FL 33731-1399
PO BOX 1400, SAINT PETERSBURG, FL 33731-1400
PO BOX 1401, SAINT PETERSBURG, FL 33731-1401
PO BOX 1402, SAINT PETERSBURG, FL 33731-1402
PO BOX 1403, SAINT PETERSBURG, FL 33731-1403
PO BOX 1404, SAINT PETERSBURG, FL 33731-1404
PO BOX 1405, SAINT PETERSBURG, FL 33731-1405
PO BOX 1406, SAINT PETERSBURG, FL 33731-1406
PO BOX 1407, SAINT PETERSBURG, FL 33731-1407
PO BOX 1408, SAINT PETERSBURG, FL 33731-1408
PO BOX 1409, SAINT PETERSBURG, FL 33731-1409
PO BOX 1410, SAINT PETERSBURG, FL 33731-1410
PO BOX 1411, SAINT PETERSBURG, FL 33731-1411
PO BOX 1412, SAINT PETERSBURG, FL 33731-1412
PO BOX 1413, SAINT PETERSBURG, FL 33731-1413
PO BOX 1414, SAINT PETERSBURG, FL 33731-1414
PO BOX 1415, SAINT PETERSBURG, FL 33731-1415
PO BOX 1416, SAINT PETERSBURG, FL 33731-1416
PO BOX 1417, SAINT PETERSBURG, FL 33731-1417
PO BOX 1418, SAINT PETERSBURG, FL 33731-1418
PO BOX 1419, SAINT PETERSBURG, FL 33731-1419
PO BOX 1420, SAINT PETERSBURG, FL 33731-1420
PO BOX 1421, SAINT PETERSBURG, FL 33731-1421
PO BOX 1422, SAINT PETERSBURG, FL 33731-1422
PO BOX 1423, SAINT PETERSBURG, FL 33731-1423
PO BOX 1424, SAINT PETERSBURG, FL 33731-1424
PO BOX 1425, SAINT PETERSBURG, FL 33731-1425
PO BOX 1426, SAINT PETERSBURG, FL 33731-1426
PO BOX 1427, SAINT PETERSBURG, FL 33731-1427
PO BOX 1428, SAINT PETERSBURG, FL 33731-1428
PO BOX 1429, SAINT PETERSBURG, FL 33731-1429
PO BOX 1430, SAINT PETERSBURG, FL 33731-1430
PO BOX 1431, SAINT PETERSBURG, FL 33731-1431
PO BOX 1432, SAINT PETERSBURG, FL 33731-1432
PO BOX 1433, SAINT PETERSBURG, FL 33731-1433
PO BOX 1434, SAINT PETERSBURG, FL 33731-1434
PO BOX 1435, SAINT PETERSBURG, FL 33731-1435
PO BOX 1436, SAINT PETERSBURG, FL 33731-1436
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