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 2380, CARLSBAD, CA 92018-2380
PO BOX 2381, CARLSBAD, CA 92018-2381
PO BOX 2382, CARLSBAD, CA 92018-2382
PO BOX 2383, CARLSBAD, CA 92018-2383
PO BOX 2384, CARLSBAD, CA 92018-2384
PO BOX 2385, CARLSBAD, CA 92018-2385
PO BOX 2386, CARLSBAD, CA 92018-2386
PO BOX 2387, CARLSBAD, CA 92018-2387
PO BOX 2388, CARLSBAD, CA 92018-2388
PO BOX 2389, CARLSBAD, CA 92018-2389
PO BOX 2390, CARLSBAD, CA 92018-2390
PO BOX 2391, CARLSBAD, CA 92018-2391
PO BOX 2392, CARLSBAD, CA 92018-2392
PO BOX 2393, CARLSBAD, CA 92018-2393
PO BOX 2394, CARLSBAD, CA 92018-2394
PO BOX 2395, CARLSBAD, CA 92018-2395
PO BOX 2396, CARLSBAD, CA 92018-2396
PO BOX 2397, CARLSBAD, CA 92018-2397
PO BOX 2398, CARLSBAD, CA 92018-2398
PO BOX 2399, CARLSBAD, CA 92018-2399
PO BOX 2400, CARLSBAD, CA 92018-2400
PO BOX 2401, CARLSBAD, CA 92018-2401
PO BOX 2402, CARLSBAD, CA 92018-2402
PO BOX 2403, CARLSBAD, CA 92018-2403
PO BOX 2404, CARLSBAD, CA 92018-2404
PO BOX 2405, CARLSBAD, CA 92018-2405
PO BOX 2406, CARLSBAD, CA 92018-2406
PO BOX 2407, CARLSBAD, CA 92018-2407
PO BOX 2408, CARLSBAD, CA 92018-2408
PO BOX 2409, CARLSBAD, CA 92018-2409
PO BOX 2410, CARLSBAD, CA 92018-2410
PO BOX 2411, CARLSBAD, CA 92018-2411
PO BOX 2412, CARLSBAD, CA 92018-2412
PO BOX 2413, CARLSBAD, CA 92018-2413
PO BOX 2414, CARLSBAD, CA 92018-2414
PO BOX 2415, CARLSBAD, CA 92018-2415
PO BOX 2416, CARLSBAD, CA 92018-2416
PO BOX 2417, CARLSBAD, CA 92018-2417
PO BOX 2418, CARLSBAD, CA 92018-2418
PO BOX 2419, CARLSBAD, CA 92018-2419
PO BOX 2420, CARLSBAD, CA 92018-2420
PO BOX 2421, CARLSBAD, CA 92018-2421
PO BOX 2422, CARLSBAD, CA 92018-2422
PO BOX 2423, CARLSBAD, CA 92018-2423
PO BOX 2424, CARLSBAD, CA 92018-2424
PO BOX 2425, CARLSBAD, CA 92018-2425
PO BOX 2426, CARLSBAD, CA 92018-2426
PO BOX 2427, CARLSBAD, CA 92018-2427
PO BOX 2428, CARLSBAD, CA 92018-2428
PO BOX 2429, CARLSBAD, CA 92018-2429
PO BOX 2430, CARLSBAD, CA 92018-2430
PO BOX 2431, CARLSBAD, CA 92018-2431
PO BOX 2432, CARLSBAD, CA 92018-2432
PO BOX 2433, CARLSBAD, CA 92018-2433
PO BOX 2434, CARLSBAD, CA 92018-2434
PO BOX 2435, CARLSBAD, CA 92018-2435
PO BOX 2436, CARLSBAD, CA 92018-2436
PO BOX 2437, CARLSBAD, CA 92018-2437
PO BOX 2438, CARLSBAD, CA 92018-2438
PO BOX 2439, CARLSBAD, CA 92018-2439
PO BOX 2440, CARLSBAD, CA 92018-2440
PO BOX 2441, CARLSBAD, CA 92018-2441
PO BOX 2442, CARLSBAD, CA 92018-2442
PO BOX 2443, CARLSBAD, CA 92018-2443
PO BOX 2444, CARLSBAD, CA 92018-2444
PO BOX 2445, CARLSBAD, CA 92018-2445
PO BOX 2446, CARLSBAD, CA 92018-2446
PO BOX 2447, CARLSBAD, CA 92018-2447
PO BOX 2448, CARLSBAD, CA 92018-2448
PO BOX 2449, CARLSBAD, CA 92018-2449
PO BOX 2450, CARLSBAD, CA 92018-2450
PO BOX 2451, CARLSBAD, CA 92018-2451
PO BOX 2452, CARLSBAD, CA 92018-2452
PO BOX 2453, CARLSBAD, CA 92018-2453
PO BOX 2454, CARLSBAD, CA 92018-2454
PO BOX 2455, CARLSBAD, CA 92018-2455
PO BOX 2456, CARLSBAD, CA 92018-2456
PO BOX 2457, CARLSBAD, CA 92018-2457
PO BOX 2458, CARLSBAD, CA 92018-2458
PO BOX 2459, CARLSBAD, CA 92018-2459
PO BOX 2460, CARLSBAD, CA 92018-2460
PO BOX 2461, CARLSBAD, CA 92018-2461
PO BOX 2462, CARLSBAD, CA 92018-2462
PO BOX 2463, CARLSBAD, CA 92018-2463
PO BOX 2464, CARLSBAD, CA 92018-2464
PO BOX 2465, CARLSBAD, CA 92018-2465
PO BOX 2466, CARLSBAD, CA 92018-2466
PO BOX 2467, CARLSBAD, CA 92018-2467
PO BOX 2468, CARLSBAD, CA 92018-2468
PO BOX 2469, CARLSBAD, CA 92018-2469
PO BOX 2470, CARLSBAD, CA 92018-2470
PO BOX 2471, CARLSBAD, CA 92018-2471
PO BOX 2472, CARLSBAD, CA 92018-2472
PO BOX 2473, CARLSBAD, CA 92018-2473
PO BOX 2474, CARLSBAD, CA 92018-2474
PO BOX 2475, CARLSBAD, CA 92018-2475
PO BOX 2476, CARLSBAD, CA 92018-2476
PO BOX 2477, CARLSBAD, CA 92018-2477
PO BOX 2478, CARLSBAD, CA 92018-2478
PO BOX 2479, CARLSBAD, CA 92018-2479
PO BOX 2480, CARLSBAD, CA 92018-2480
PO BOX 2481, CARLSBAD, CA 92018-2481
PO BOX 2482, CARLSBAD, CA 92018-2482
PO BOX 2483, CARLSBAD, CA 92018-2483
PO BOX 2484, CARLSBAD, CA 92018-2484
PO BOX 2485, CARLSBAD, CA 92018-2485
PO BOX 2486, CARLSBAD, CA 92018-2486
PO BOX 2487, CARLSBAD, CA 92018-2487
PO BOX 2488, CARLSBAD, CA 92018-2488
PO BOX 2489, CARLSBAD, CA 92018-2489
PO BOX 2490, CARLSBAD, CA 92018-2490
PO BOX 2491, CARLSBAD, CA 92018-2491
PO BOX 2492, CARLSBAD, CA 92018-2492
PO BOX 2493, CARLSBAD, CA 92018-2493
PO BOX 2494, CARLSBAD, CA 92018-2494
PO BOX 2495, CARLSBAD, CA 92018-2495
PO BOX 2496, CARLSBAD, CA 92018-2496
PO BOX 2497, CARLSBAD, CA 92018-2497
PO BOX 2498, CARLSBAD, CA 92018-2498
PO BOX 2499, CARLSBAD, CA 92018-2499
PO BOX 2500, CARLSBAD, CA 92018-2500
PO BOX 2501, CARLSBAD, CA 92018-2501
PO BOX 2502, CARLSBAD, CA 92018-2502
PO BOX 2503, CARLSBAD, CA 92018-2503
PO BOX 2504, CARLSBAD, CA 92018-2504
PO BOX 2505, CARLSBAD, CA 92018-2505
PO BOX 2506, CARLSBAD, CA 92018-2506
PO BOX 2507, CARLSBAD, CA 92018-2507
PO BOX 2508, CARLSBAD, CA 92018-2508
PO BOX 2509, CARLSBAD, CA 92018-2509
PO BOX 2510, CARLSBAD, CA 92018-2510
PO BOX 2511, CARLSBAD, CA 92018-2511
PO BOX 2512, CARLSBAD, CA 92018-2512
PO BOX 2513, CARLSBAD, CA 92018-2513
PO BOX 2514, CARLSBAD, CA 92018-2514
PO BOX 2515, CARLSBAD, CA 92018-2515
PO BOX 2516, CARLSBAD, CA 92018-2516
PO BOX 2517, CARLSBAD, CA 92018-2517
PO BOX 2518, CARLSBAD, CA 92018-2518
PO BOX 2519, CARLSBAD, CA 92018-2519
PO BOX 2520, CARLSBAD, CA 92018-2520
PO BOX 2521, CARLSBAD, CA 92018-2521
PO BOX 2522, CARLSBAD, CA 92018-2522
PO BOX 2523, CARLSBAD, CA 92018-2523
PO BOX 2524, CARLSBAD, CA 92018-2524
PO BOX 2525, CARLSBAD, CA 92018-2525
PO BOX 2526, CARLSBAD, CA 92018-2526
PO BOX 2527, CARLSBAD, CA 92018-2527
PO BOX 2528, CARLSBAD, CA 92018-2528
PO BOX 2529, CARLSBAD, CA 92018-2529
PO BOX 2530, CARLSBAD, CA 92018-2530
PO BOX 2531, CARLSBAD, CA 92018-2531
PO BOX 2532, CARLSBAD, CA 92018-2532
PO BOX 2533, CARLSBAD, CA 92018-2533
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