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 1200, LA CANADA FLINTRIDGE, CA 91012-5200
PO BOX 1201, LA CANADA FLINTRIDGE, CA 91012-5201
PO BOX 1202, LA CANADA FLINTRIDGE, CA 91012-5202
PO BOX 1203, LA CANADA FLINTRIDGE, CA 91012-5203
PO BOX 1204, LA CANADA FLINTRIDGE, CA 91012-5204
PO BOX 1205, LA CANADA FLINTRIDGE, CA 91012-5205
PO BOX 1206, LA CANADA FLINTRIDGE, CA 91012-5206
PO BOX 1207, LA CANADA FLINTRIDGE, CA 91012-5207
PO BOX 1208, LA CANADA FLINTRIDGE, CA 91012-5208
PO BOX 1209, LA CANADA FLINTRIDGE, CA 91012-5209
PO BOX 1210, LA CANADA FLINTRIDGE, CA 91012-5210
PO BOX 1211, LA CANADA FLINTRIDGE, CA 91012-5211
PO BOX 1212, LA CANADA FLINTRIDGE, CA 91012-5212
PO BOX 1213, LA CANADA FLINTRIDGE, CA 91012-5213
PO BOX 1214, LA CANADA FLINTRIDGE, CA 91012-5214
PO BOX 1215, LA CANADA FLINTRIDGE, CA 91012-5215
PO BOX 1216, LA CANADA FLINTRIDGE, CA 91012-5216
PO BOX 1217, LA CANADA FLINTRIDGE, CA 91012-5217
PO BOX 1218, LA CANADA FLINTRIDGE, CA 91012-5218
PO BOX 1219, LA CANADA FLINTRIDGE, CA 91012-5219
PO BOX 1220, LA CANADA FLINTRIDGE, CA 91012-5220
PO BOX 1221, LA CANADA FLINTRIDGE, CA 91012-5221
PO BOX 1222, LA CANADA FLINTRIDGE, CA 91012-5222
PO BOX 1223, LA CANADA FLINTRIDGE, CA 91012-5223
PO BOX 1224, LA CANADA FLINTRIDGE, CA 91012-5224
PO BOX 1225, LA CANADA FLINTRIDGE, CA 91012-5225
PO BOX 1226, LA CANADA FLINTRIDGE, CA 91012-5226
PO BOX 1227, LA CANADA FLINTRIDGE, CA 91012-5227
PO BOX 1228, LA CANADA FLINTRIDGE, CA 91012-5228
PO BOX 1229, LA CANADA FLINTRIDGE, CA 91012-5229
PO BOX 1230, LA CANADA FLINTRIDGE, CA 91012-5230
PO BOX 1231, LA CANADA FLINTRIDGE, CA 91012-5231
PO BOX 1232, LA CANADA FLINTRIDGE, CA 91012-5232
PO BOX 1233, LA CANADA FLINTRIDGE, CA 91012-5233
PO BOX 1234, LA CANADA FLINTRIDGE, CA 91012-5234
PO BOX 1235, LA CANADA FLINTRIDGE, CA 91012-5235
PO BOX 1236, LA CANADA FLINTRIDGE, CA 91012-5236
PO BOX 1237, LA CANADA FLINTRIDGE, CA 91012-5237
PO BOX 1238, LA CANADA FLINTRIDGE, CA 91012-5238
PO BOX 1239, LA CANADA FLINTRIDGE, CA 91012-5239
PO BOX 1240, LA CANADA FLINTRIDGE, CA 91012-5240
PO BOX 1241, LA CANADA FLINTRIDGE, CA 91012-5241
PO BOX 1242, LA CANADA FLINTRIDGE, CA 91012-5242
PO BOX 1243, LA CANADA FLINTRIDGE, CA 91012-5243
PO BOX 1244, LA CANADA FLINTRIDGE, CA 91012-5244
PO BOX 1245, LA CANADA FLINTRIDGE, CA 91012-5245
PO BOX 1246, LA CANADA FLINTRIDGE, CA 91012-5246
PO BOX 1247, LA CANADA FLINTRIDGE, CA 91012-5247
PO BOX 1248, LA CANADA FLINTRIDGE, CA 91012-5248
PO BOX 1249, LA CANADA FLINTRIDGE, CA 91012-5249
PO BOX 1250, LA CANADA FLINTRIDGE, CA 91012-5250
PO BOX 1251, LA CANADA FLINTRIDGE, CA 91012-5251
PO BOX 1252, LA CANADA FLINTRIDGE, CA 91012-5252
PO BOX 1253, LA CANADA FLINTRIDGE, CA 91012-5253
PO BOX 1254, LA CANADA FLINTRIDGE, CA 91012-5254
PO BOX 1255, LA CANADA FLINTRIDGE, CA 91012-5255
PO BOX 1256, LA CANADA FLINTRIDGE, CA 91012-5256
PO BOX 1257, LA CANADA FLINTRIDGE, CA 91012-5257
PO BOX 1258, LA CANADA FLINTRIDGE, CA 91012-5258
PO BOX 1259, LA CANADA FLINTRIDGE, CA 91012-5259
PO BOX 1260, LA CANADA FLINTRIDGE, CA 91012-5260
PO BOX 1261, LA CANADA FLINTRIDGE, CA 91012-5261
PO BOX 1262, LA CANADA FLINTRIDGE, CA 91012-5262
PO BOX 1263, LA CANADA FLINTRIDGE, CA 91012-5263
PO BOX 1264, LA CANADA FLINTRIDGE, CA 91012-5264
PO BOX 1265, LA CANADA FLINTRIDGE, CA 91012-5265
PO BOX 1266, LA CANADA FLINTRIDGE, CA 91012-5266
PO BOX 1267, LA CANADA FLINTRIDGE, CA 91012-5267
PO BOX 1268, LA CANADA FLINTRIDGE, CA 91012-5268
PO BOX 1269, LA CANADA FLINTRIDGE, CA 91012-5269
PO BOX 1270, LA CANADA FLINTRIDGE, CA 91012-5270
PO BOX 1271, LA CANADA FLINTRIDGE, CA 91012-5271
PO BOX 1272, LA CANADA FLINTRIDGE, CA 91012-5272
PO BOX 1273, LA CANADA FLINTRIDGE, CA 91012-5273
PO BOX 1274, LA CANADA FLINTRIDGE, CA 91012-5274
PO BOX 1275, LA CANADA FLINTRIDGE, CA 91012-5275
PO BOX 1276, LA CANADA FLINTRIDGE, CA 91012-5276
PO BOX 1277, LA CANADA FLINTRIDGE, CA 91012-5277
PO BOX 1278, LA CANADA FLINTRIDGE, CA 91012-5278
PO BOX 1279, LA CANADA FLINTRIDGE, CA 91012-5279
PO BOX 1280, LA CANADA FLINTRIDGE, CA 91012-5280
PO BOX 1281, LA CANADA FLINTRIDGE, CA 91012-5281
PO BOX 1282, LA CANADA FLINTRIDGE, CA 91012-5282
PO BOX 1283, LA CANADA FLINTRIDGE, CA 91012-5283
PO BOX 1284, LA CANADA FLINTRIDGE, CA 91012-5284
PO BOX 1285, LA CANADA FLINTRIDGE, CA 91012-5285
PO BOX 1286, LA CANADA FLINTRIDGE, CA 91012-5286
PO BOX 1287, LA CANADA FLINTRIDGE, CA 91012-5287
PO BOX 1288, LA CANADA FLINTRIDGE, CA 91012-5288
PO BOX 1289, LA CANADA FLINTRIDGE, CA 91012-5289
PO BOX 1290, LA CANADA FLINTRIDGE, CA 91012-5290
PO BOX 1291, LA CANADA FLINTRIDGE, CA 91012-5291
PO BOX 1292, LA CANADA FLINTRIDGE, CA 91012-5292
PO BOX 1293, LA CANADA FLINTRIDGE, CA 91012-5293
PO BOX 1294, LA CANADA FLINTRIDGE, CA 91012-5294
PO BOX 1295, LA CANADA FLINTRIDGE, CA 91012-5295
PO BOX 1296, LA CANADA FLINTRIDGE, CA 91012-5296
PO BOX 1297, LA CANADA FLINTRIDGE, CA 91012-5297
PO BOX 1298, LA CANADA FLINTRIDGE, CA 91012-5298
PO BOX 1299, LA CANADA FLINTRIDGE, CA 91012-5299
PO BOX 1300, LA CANADA FLINTRIDGE, CA 91012-5300
PO BOX 1301, LA CANADA FLINTRIDGE, CA 91012-5301
PO BOX 1302, LA CANADA FLINTRIDGE, CA 91012-5302
PO BOX 1303, LA CANADA FLINTRIDGE, CA 91012-5303
PO BOX 1304, LA CANADA FLINTRIDGE, CA 91012-5304
PO BOX 1305, LA CANADA FLINTRIDGE, CA 91012-5305
PO BOX 1306, LA CANADA FLINTRIDGE, CA 91012-5306
PO BOX 1307, LA CANADA FLINTRIDGE, CA 91012-5307
PO BOX 1308, LA CANADA FLINTRIDGE, CA 91012-5308
PO BOX 1309, LA CANADA FLINTRIDGE, CA 91012-5309
PO BOX 1310, LA CANADA FLINTRIDGE, CA 91012-5310
PO BOX 1311, LA CANADA FLINTRIDGE, CA 91012-5311
PO BOX 1312, LA CANADA FLINTRIDGE, CA 91012-5312
PO BOX 1313, LA CANADA FLINTRIDGE, CA 91012-5313
PO BOX 1314, LA CANADA FLINTRIDGE, CA 91012-5314
PO BOX 1315, LA CANADA FLINTRIDGE, CA 91012-5315
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