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 432400, SAN YSIDRO, CA 92143-2400
PO BOX 432401, SAN YSIDRO, CA 92143-2401
PO BOX 432402, SAN YSIDRO, CA 92143-2402
PO BOX 432403, SAN YSIDRO, CA 92143-2403
PO BOX 432404, SAN YSIDRO, CA 92143-2404
PO BOX 432405, SAN YSIDRO, CA 92143-2405
PO BOX 432406, SAN YSIDRO, CA 92143-2406
PO BOX 432407, SAN YSIDRO, CA 92143-2407
PO BOX 432408, SAN YSIDRO, CA 92143-2408
PO BOX 432409, SAN YSIDRO, CA 92143-2409
PO BOX 432410, SAN YSIDRO, CA 92143-2410
PO BOX 432411, SAN YSIDRO, CA 92143-2411
PO BOX 432412, SAN YSIDRO, CA 92143-2412
PO BOX 432413, SAN YSIDRO, CA 92143-2413
PO BOX 432414, SAN YSIDRO, CA 92143-2414
PO BOX 432415, SAN YSIDRO, CA 92143-2415
PO BOX 432416, SAN YSIDRO, CA 92143-2416
PO BOX 432417, SAN YSIDRO, CA 92143-2417
PO BOX 432418, SAN YSIDRO, CA 92143-2418
PO BOX 432419, SAN YSIDRO, CA 92143-2419
PO BOX 432420, SAN YSIDRO, CA 92143-2420
PO BOX 432421, SAN YSIDRO, CA 92143-2421
PO BOX 432422, SAN YSIDRO, CA 92143-2422
PO BOX 432423, SAN YSIDRO, CA 92143-2423
PO BOX 432424, SAN YSIDRO, CA 92143-2424
PO BOX 432425, SAN YSIDRO, CA 92143-2425
PO BOX 432426, SAN YSIDRO, CA 92143-2426
PO BOX 432427, SAN YSIDRO, CA 92143-2427
PO BOX 432428, SAN YSIDRO, CA 92143-2428
PO BOX 432429, SAN YSIDRO, CA 92143-2429
PO BOX 432430, SAN YSIDRO, CA 92143-2430
PO BOX 432431, SAN YSIDRO, CA 92143-2431
PO BOX 432432, SAN YSIDRO, CA 92143-2432
PO BOX 432433, SAN YSIDRO, CA 92143-2433
PO BOX 432434, SAN YSIDRO, CA 92143-2434
PO BOX 432435, SAN YSIDRO, CA 92143-2435
PO BOX 432436, SAN YSIDRO, CA 92143-2436
PO BOX 432437, SAN YSIDRO, CA 92143-2437
PO BOX 432438, SAN YSIDRO, CA 92143-2438
PO BOX 432439, SAN YSIDRO, CA 92143-2439
PO BOX 432440, SAN YSIDRO, CA 92143-2440
PO BOX 432441, SAN YSIDRO, CA 92143-2441
PO BOX 432442, SAN YSIDRO, CA 92143-2442
PO BOX 432443, SAN YSIDRO, CA 92143-2443
PO BOX 432444, SAN YSIDRO, CA 92143-2444
PO BOX 432445, SAN YSIDRO, CA 92143-2445
PO BOX 432446, SAN YSIDRO, CA 92143-2446
PO BOX 432447, SAN YSIDRO, CA 92143-2447
PO BOX 432448, SAN YSIDRO, CA 92143-2448
PO BOX 432449, SAN YSIDRO, CA 92143-2449
PO BOX 432450, SAN YSIDRO, CA 92143-2450
PO BOX 432451, SAN YSIDRO, CA 92143-2451
PO BOX 432452, SAN YSIDRO, CA 92143-2452
PO BOX 432453, SAN YSIDRO, CA 92143-2453
PO BOX 432454, SAN YSIDRO, CA 92143-2454
PO BOX 432455, SAN YSIDRO, CA 92143-2455
PO BOX 432456, SAN YSIDRO, CA 92143-2456
PO BOX 432457, SAN YSIDRO, CA 92143-2457
PO BOX 432458, SAN YSIDRO, CA 92143-2458
PO BOX 432459, SAN YSIDRO, CA 92143-2459
PO BOX 432460, SAN YSIDRO, CA 92143-2460
PO BOX 432461, SAN YSIDRO, CA 92143-2461
PO BOX 432462, SAN YSIDRO, CA 92143-2462
PO BOX 432463, SAN YSIDRO, CA 92143-2463
PO BOX 432464, SAN YSIDRO, CA 92143-2464
PO BOX 432465, SAN YSIDRO, CA 92143-2465
PO BOX 432466, SAN YSIDRO, CA 92143-2466
PO BOX 432467, SAN YSIDRO, CA 92143-2467
PO BOX 432468, SAN YSIDRO, CA 92143-2468
PO BOX 432469, SAN YSIDRO, CA 92143-2469
PO BOX 432470, SAN YSIDRO, CA 92143-2470
PO BOX 432471, SAN YSIDRO, CA 92143-2471
PO BOX 432472, SAN YSIDRO, CA 92143-2472
PO BOX 432473, SAN YSIDRO, CA 92143-2473
PO BOX 432474, SAN YSIDRO, CA 92143-2474
PO BOX 432475, SAN YSIDRO, CA 92143-2475
PO BOX 432476, SAN YSIDRO, CA 92143-2476
PO BOX 432477, SAN YSIDRO, CA 92143-2477
PO BOX 432478, SAN YSIDRO, CA 92143-2478
PO BOX 432479, SAN YSIDRO, CA 92143-2479
PO BOX 432480, SAN YSIDRO, CA 92143-2480
PO BOX 432481, SAN YSIDRO, CA 92143-2481
PO BOX 432482, SAN YSIDRO, CA 92143-2482
PO BOX 432483, SAN YSIDRO, CA 92143-2483
PO BOX 432484, SAN YSIDRO, CA 92143-2484
PO BOX 432485, SAN YSIDRO, CA 92143-2485
PO BOX 432486, SAN YSIDRO, CA 92143-2486
PO BOX 432487, SAN YSIDRO, CA 92143-2487
PO BOX 432488, SAN YSIDRO, CA 92143-2488
PO BOX 432489, SAN YSIDRO, CA 92143-2489
PO BOX 432490, SAN YSIDRO, CA 92143-2490
PO BOX 432491, SAN YSIDRO, CA 92143-2491
PO BOX 432492, SAN YSIDRO, CA 92143-2492
PO BOX 432493, SAN YSIDRO, CA 92143-2493
PO BOX 432494, SAN YSIDRO, CA 92143-2494
PO BOX 432495, SAN YSIDRO, CA 92143-2495
PO BOX 432496, SAN YSIDRO, CA 92143-2496
PO BOX 432497, SAN YSIDRO, CA 92143-2497
PO BOX 432498, SAN YSIDRO, CA 92143-2498
PO BOX 432499, SAN YSIDRO, CA 92143-2499
PO BOX 432500, SAN YSIDRO, CA 92143-2500
PO BOX 432501, SAN YSIDRO, CA 92143-2501
PO BOX 432502, SAN YSIDRO, CA 92143-2502
PO BOX 432503, SAN YSIDRO, CA 92143-2503
PO BOX 432504, SAN YSIDRO, CA 92143-2504
PO BOX 432505, SAN YSIDRO, CA 92143-2505
PO BOX 432506, SAN YSIDRO, CA 92143-2506
PO BOX 432507, SAN YSIDRO, CA 92143-2507
PO BOX 432508, SAN YSIDRO, CA 92143-2508
PO BOX 432509, SAN YSIDRO, CA 92143-2509
PO BOX 432510, SAN YSIDRO, CA 92143-2510
PO BOX 432511, SAN YSIDRO, CA 92143-2511
PO BOX 432512, SAN YSIDRO, CA 92143-2512
PO BOX 432513, SAN YSIDRO, CA 92143-2513
PO BOX 432514, SAN YSIDRO, CA 92143-2514
PO BOX 432515, SAN YSIDRO, CA 92143-2515
PO BOX 432516, SAN YSIDRO, CA 92143-2516
PO BOX 432517, SAN YSIDRO, CA 92143-2517
PO BOX 432518, SAN YSIDRO, CA 92143-2518
PO BOX 432519, SAN YSIDRO, CA 92143-2519
PO BOX 432520, SAN YSIDRO, CA 92143-2520
PO BOX 432521, SAN YSIDRO, CA 92143-2521
PO BOX 432522, SAN YSIDRO, CA 92143-2522
PO BOX 432523, SAN YSIDRO, CA 92143-2523
PO BOX 432524, SAN YSIDRO, CA 92143-2524
PO BOX 432525, SAN YSIDRO, CA 92143-2525
PO BOX 432526, SAN YSIDRO, CA 92143-2526
PO BOX 432527, SAN YSIDRO, CA 92143-2527
PO BOX 432528, SAN YSIDRO, CA 92143-2528
PO BOX 432529, SAN YSIDRO, CA 92143-2529
PO BOX 432530, SAN YSIDRO, CA 92143-2530
PO BOX 432531, SAN YSIDRO, CA 92143-2531
PO BOX 432532, SAN YSIDRO, CA 92143-2532
PO BOX 432533, SAN YSIDRO, CA 92143-2533
PO BOX 432534, SAN YSIDRO, CA 92143-2534
PO BOX 432535, SAN YSIDRO, CA 92143-2535
PO BOX 432536, SAN YSIDRO, CA 92143-2536
PO BOX 432537, SAN YSIDRO, CA 92143-2537
PO BOX 432538, SAN YSIDRO, CA 92143-2538
PO BOX 432539, SAN YSIDRO, CA 92143-2539
PO BOX 432540, SAN YSIDRO, CA 92143-2540
PO BOX 432541, SAN YSIDRO, CA 92143-2541
PO BOX 432542, SAN YSIDRO, CA 92143-2542
PO BOX 432543, SAN YSIDRO, CA 92143-2543
PO BOX 432544, SAN YSIDRO, CA 92143-2544
PO BOX 432545, SAN YSIDRO, CA 92143-2545
PO BOX 432546, SAN YSIDRO, CA 92143-2546
PO BOX 432547, SAN YSIDRO, CA 92143-2547
PO BOX 432548, SAN YSIDRO, CA 92143-2548
PO BOX 432549, SAN YSIDRO, CA 92143-2549
PO BOX 432550, SAN YSIDRO, CA 92143-2550
PO BOX 432551, SAN YSIDRO, CA 92143-2551
PO BOX 432552, SAN YSIDRO, CA 92143-2552
PO BOX 432553, SAN YSIDRO, CA 92143-2553
PO BOX 432554, SAN YSIDRO, CA 92143-2554
PO BOX 432555, SAN YSIDRO, CA 92143-2555
PO BOX 432556, SAN YSIDRO, CA 92143-2556
PO BOX 432557, SAN YSIDRO, CA 92143-2557
PO BOX 432558, SAN YSIDRO, CA 92143-2558
PO BOX 432559, SAN YSIDRO, CA 92143-2559
PO BOX 432560, SAN YSIDRO, CA 92143-2560
PO BOX 432561, SAN YSIDRO, CA 92143-2561
PO BOX 432562, SAN YSIDRO, CA 92143-2562
PO BOX 432563, SAN YSIDRO, CA 92143-2563
PO BOX 432564, SAN YSIDRO, CA 92143-2564
PO BOX 432565, SAN YSIDRO, CA 92143-2565
PO BOX 432566, SAN YSIDRO, CA 92143-2566
PO BOX 432567, SAN YSIDRO, CA 92143-2567
PO BOX 432568, SAN YSIDRO, CA 92143-2568
PO BOX 432569, SAN YSIDRO, CA 92143-2569
PO BOX 432570, SAN YSIDRO, CA 92143-2570
PO BOX 432571, SAN YSIDRO, CA 92143-2571
PO BOX 432572, SAN YSIDRO, CA 92143-2572
PO BOX 432573, SAN YSIDRO, CA 92143-2573
PO BOX 432574, SAN YSIDRO, CA 92143-2574
PO BOX 432575, SAN YSIDRO, CA 92143-2575
PO BOX 432576, SAN YSIDRO, CA 92143-2576
PO BOX 432577, SAN YSIDRO, CA 92143-2577
PO BOX 432578, SAN YSIDRO, CA 92143-2578
PO BOX 432579, SAN YSIDRO, CA 92143-2579
PO BOX 432580, SAN YSIDRO, CA 92143-2580
PO BOX 432581, SAN YSIDRO, CA 92143-2581
PO BOX 432582, SAN YSIDRO, CA 92143-2582
PO BOX 432583, SAN YSIDRO, CA 92143-2583
PO BOX 432584, SAN YSIDRO, CA 92143-2584
PO BOX 432585, SAN YSIDRO, CA 92143-2585
PO BOX 432586, SAN YSIDRO, CA 92143-2586
PO BOX 432587, SAN YSIDRO, CA 92143-2587
PO BOX 432588, SAN YSIDRO, CA 92143-2588
PO BOX 432589, SAN YSIDRO, CA 92143-2589
PO BOX 432590, SAN YSIDRO, CA 92143-2590
PO BOX 432591, SAN YSIDRO, CA 92143-2591
PO BOX 432592, SAN YSIDRO, CA 92143-2592
PO BOX 432593, SAN YSIDRO, CA 92143-2593
PO BOX 432594, SAN YSIDRO, CA 92143-2594
PO BOX 432595, SAN YSIDRO, CA 92143-2595
PO BOX 432596, SAN YSIDRO, CA 92143-2596
PO BOX 432597, SAN YSIDRO, CA 92143-2597
PO BOX 432598, SAN YSIDRO, CA 92143-2598
PO BOX 432599, SAN YSIDRO, CA 92143-2599
PO BOX 432600, SAN YSIDRO, CA 92143-2600
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