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 12541, SANTA BARBARA, CA 93107-2541
PO BOX 12542, SANTA BARBARA, CA 93107-2542
PO BOX 12543, SANTA BARBARA, CA 93107-2543
PO BOX 12544, SANTA BARBARA, CA 93107-2544
PO BOX 12545, SANTA BARBARA, CA 93107-2545
PO BOX 12546, SANTA BARBARA, CA 93107-2546
PO BOX 12547, SANTA BARBARA, CA 93107-2547
PO BOX 12548, SANTA BARBARA, CA 93107-2548
PO BOX 12549, SANTA BARBARA, CA 93107-2549
PO BOX 12550, SANTA BARBARA, CA 93107-2550
PO BOX 12551, SANTA BARBARA, CA 93107-2551
PO BOX 12552, SANTA BARBARA, CA 93107-2552
PO BOX 12553, SANTA BARBARA, CA 93107-2553
PO BOX 12554, SANTA BARBARA, CA 93107-2554
PO BOX 12555, SANTA BARBARA, CA 93107-2555
PO BOX 12556, SANTA BARBARA, CA 93107-2556
PO BOX 12557, SANTA BARBARA, CA 93107-2557
PO BOX 12558, SANTA BARBARA, CA 93107-2558
PO BOX 12559, SANTA BARBARA, CA 93107-2559
PO BOX 12560, SANTA BARBARA, CA 93107-2560
PO BOX 12561, SANTA BARBARA, CA 93107-2561
PO BOX 12562, SANTA BARBARA, CA 93107-2562
PO BOX 12563, SANTA BARBARA, CA 93107-2563
PO BOX 12564, SANTA BARBARA, CA 93107-2564
PO BOX 12565, SANTA BARBARA, CA 93107-2565
PO BOX 12566, SANTA BARBARA, CA 93107-2566
PO BOX 12567, SANTA BARBARA, CA 93107-2567
PO BOX 12568, SANTA BARBARA, CA 93107-2568
PO BOX 12569, SANTA BARBARA, CA 93107-2569
PO BOX 12570, SANTA BARBARA, CA 93107-2570
PO BOX 12571, SANTA BARBARA, CA 93107-2571
PO BOX 12572, SANTA BARBARA, CA 93107-2572
PO BOX 12573, SANTA BARBARA, CA 93107-2573
PO BOX 12574, SANTA BARBARA, CA 93107-2574
PO BOX 12575, SANTA BARBARA, CA 93107-2575
PO BOX 12576, SANTA BARBARA, CA 93107-2576
PO BOX 12577, SANTA BARBARA, CA 93107-2577
PO BOX 12578, SANTA BARBARA, CA 93107-2578
PO BOX 12579, SANTA BARBARA, CA 93107-2579
PO BOX 12580, SANTA BARBARA, CA 93107-2580
PO BOX 12581, SANTA BARBARA, CA 93107-2581
PO BOX 12582, SANTA BARBARA, CA 93107-2582
PO BOX 12583, SANTA BARBARA, CA 93107-2583
PO BOX 12584, SANTA BARBARA, CA 93107-2584
PO BOX 12585, SANTA BARBARA, CA 93107-2585
PO BOX 12586, SANTA BARBARA, CA 93107-2586
PO BOX 12587, SANTA BARBARA, CA 93107-2587
PO BOX 12588, SANTA BARBARA, CA 93107-2588
PO BOX 12589, SANTA BARBARA, CA 93107-2589
PO BOX 12590, SANTA BARBARA, CA 93107-2590
PO BOX 12591, SANTA BARBARA, CA 93107-2591
PO BOX 12592, SANTA BARBARA, CA 93107-2592
PO BOX 12593, SANTA BARBARA, CA 93107-2593
PO BOX 12594, SANTA BARBARA, CA 93107-2594
PO BOX 12595, SANTA BARBARA, CA 93107-2595
PO BOX 12596, SANTA BARBARA, CA 93107-2596
PO BOX 12597, SANTA BARBARA, CA 93107-2597
PO BOX 12598, SANTA BARBARA, CA 93107-2598
PO BOX 12599, SANTA BARBARA, CA 93107-2599
PO BOX 12600, SANTA BARBARA, CA 93107-2600
PO BOX 12601, SANTA BARBARA, CA 93107-2601
PO BOX 12602, SANTA BARBARA, CA 93107-2602
PO BOX 12603, SANTA BARBARA, CA 93107-2603
PO BOX 12604, SANTA BARBARA, CA 93107-2604
PO BOX 12605, SANTA BARBARA, CA 93107-2605
PO BOX 12606, SANTA BARBARA, CA 93107-2606
PO BOX 12607, SANTA BARBARA, CA 93107-2607
PO BOX 12608, SANTA BARBARA, CA 93107-2608
PO BOX 12609, SANTA BARBARA, CA 93107-2609
PO BOX 12610, SANTA BARBARA, CA 93107-2610
PO BOX 12611, SANTA BARBARA, CA 93107-2611
PO BOX 12612, SANTA BARBARA, CA 93107-2612
PO BOX 12613, SANTA BARBARA, CA 93107-2613
PO BOX 12614, SANTA BARBARA, CA 93107-2614
PO BOX 12615, SANTA BARBARA, CA 93107-2615
PO BOX 12616, SANTA BARBARA, CA 93107-2616
PO BOX 12617, SANTA BARBARA, CA 93107-2617
PO BOX 12618, SANTA BARBARA, CA 93107-2618
PO BOX 12619, SANTA BARBARA, CA 93107-2619
PO BOX 12620, SANTA BARBARA, CA 93107-2620
PO BOX 12621, SANTA BARBARA, CA 93107-2621
PO BOX 12622, SANTA BARBARA, CA 93107-2622
PO BOX 12623, SANTA BARBARA, CA 93107-2623
PO BOX 12624, SANTA BARBARA, CA 93107-2624
PO BOX 12625, SANTA BARBARA, CA 93107-2625
PO BOX 12626, SANTA BARBARA, CA 93107-2626
PO BOX 12627, SANTA BARBARA, CA 93107-2627
PO BOX 12628, SANTA BARBARA, CA 93107-2628
PO BOX 12629, SANTA BARBARA, CA 93107-2629
PO BOX 12630, SANTA BARBARA, CA 93107-2630
PO BOX 12631, SANTA BARBARA, CA 93107-2631
PO BOX 12632, SANTA BARBARA, CA 93107-2632
PO BOX 12633, SANTA BARBARA, CA 93107-2633
PO BOX 12634, SANTA BARBARA, CA 93107-2634
PO BOX 12635, SANTA BARBARA, CA 93107-2635
PO BOX 12636, SANTA BARBARA, CA 93107-2636
PO BOX 12637, SANTA BARBARA, CA 93107-2637
PO BOX 12638, SANTA BARBARA, CA 93107-2638
PO BOX 12639, SANTA BARBARA, CA 93107-2639
PO BOX 12640, SANTA BARBARA, CA 93107-2640
PO BOX 12641, SANTA BARBARA, CA 93107-2641
PO BOX 12642, SANTA BARBARA, CA 93107-2642
PO BOX 12643, SANTA BARBARA, CA 93107-2643
PO BOX 12644, SANTA BARBARA, CA 93107-2644
PO BOX 12645, SANTA BARBARA, CA 93107-2645
PO BOX 12646, SANTA BARBARA, CA 93107-2646
PO BOX 12647, SANTA BARBARA, CA 93107-2647
PO BOX 12648, SANTA BARBARA, CA 93107-2648
PO BOX 12649, SANTA BARBARA, CA 93107-2649
PO BOX 12650, SANTA BARBARA, CA 93107-2650
PO BOX 12651, SANTA BARBARA, CA 93107-2651
PO BOX 12652, SANTA BARBARA, CA 93107-2652
PO BOX 12653, SANTA BARBARA, CA 93107-2653
PO BOX 12654, SANTA BARBARA, CA 93107-2654
PO BOX 12655, SANTA BARBARA, CA 93107-2655
PO BOX 12656, SANTA BARBARA, CA 93107-2656
PO BOX 12657, SANTA BARBARA, CA 93107-2657
PO BOX 12658, SANTA BARBARA, CA 93107-2658
PO BOX 12659, SANTA BARBARA, CA 93107-2659
PO BOX 12660, SANTA BARBARA, CA 93107-2660
PO BOX 12661, SANTA BARBARA, CA 93107-2661
PO BOX 12662, SANTA BARBARA, CA 93107-2662
PO BOX 12663, SANTA BARBARA, CA 93107-2663
PO BOX 12664, SANTA BARBARA, CA 93107-2664
PO BOX 12665, SANTA BARBARA, CA 93107-2665
PO BOX 12666, SANTA BARBARA, CA 93107-2666
PO BOX 12667, SANTA BARBARA, CA 93107-2667
PO BOX 12668, SANTA BARBARA, CA 93107-2668
PO BOX 12669, SANTA BARBARA, CA 93107-2669
PO BOX 12670, SANTA BARBARA, CA 93107-2670
PO BOX 12671, SANTA BARBARA, CA 93107-2671
PO BOX 12672, SANTA BARBARA, CA 93107-2672
PO BOX 12673, SANTA BARBARA, CA 93107-2673
PO BOX 12674, SANTA BARBARA, CA 93107-2674
PO BOX 12675, SANTA BARBARA, CA 93107-2675
PO BOX 12676, SANTA BARBARA, CA 93107-2676
PO BOX 12677, SANTA BARBARA, CA 93107-2677
PO BOX 12678, SANTA BARBARA, CA 93107-2678
PO BOX 12679, SANTA BARBARA, CA 93107-2679
PO BOX 12680, SANTA BARBARA, CA 93107-2680
PO BOX 12681, SANTA BARBARA, CA 93107-2681
PO BOX 12682, SANTA BARBARA, CA 93107-2682
PO BOX 12683, SANTA BARBARA, CA 93107-2683
PO BOX 12684, SANTA BARBARA, CA 93107-2684
PO BOX 12685, SANTA BARBARA, CA 93107-2685
PO BOX 12686, SANTA BARBARA, CA 93107-2686
PO BOX 12687, SANTA BARBARA, CA 93107-2687
PO BOX 12688, SANTA BARBARA, CA 93107-2688
PO BOX 12689, SANTA BARBARA, CA 93107-2689
PO BOX 12690, SANTA BARBARA, CA 93107-2690
PO BOX 12691, SANTA BARBARA, CA 93107-2691
PO BOX 12692, SANTA BARBARA, CA 93107-2692
PO BOX 12693, SANTA BARBARA, CA 93107-2693
PO BOX 12694, SANTA BARBARA, CA 93107-2694
PO BOX 12695, SANTA BARBARA, CA 93107-2695
PO BOX 12696, SANTA BARBARA, CA 93107-2696
PO BOX 12697, SANTA BARBARA, CA 93107-2697
PO BOX 12698, SANTA BARBARA, CA 93107-2698
PO BOX 12699, SANTA BARBARA, CA 93107-2699
PO BOX 12700, SANTA BARBARA, CA 93107-2700
PO BOX 12701, SANTA BARBARA, CA 93107-2701
PO BOX 12702, SANTA BARBARA, CA 93107-2702
PO BOX 12703, SANTA BARBARA, CA 93107-2703
PO BOX 12704, SANTA BARBARA, CA 93107-2704
PO BOX 12705, SANTA BARBARA, CA 93107-2705
PO BOX 12706, SANTA BARBARA, CA 93107-2706
PO BOX 12707, SANTA BARBARA, CA 93107-2707
PO BOX 12708, SANTA BARBARA, CA 93107-2708
PO BOX 12709, SANTA BARBARA, CA 93107-2709
PO BOX 12710, SANTA BARBARA, CA 93107-2710
PO BOX 12711, SANTA BARBARA, CA 93107-2711
PO BOX 12712, SANTA BARBARA, CA 93107-2712
PO BOX 12713, SANTA BARBARA, CA 93107-2713
PO BOX 12714, SANTA BARBARA, CA 93107-2714
PO BOX 12715, SANTA BARBARA, CA 93107-2715
PO BOX 12716, SANTA BARBARA, CA 93107-2716
PO BOX 12717, SANTA BARBARA, CA 93107-2717
PO BOX 12718, SANTA BARBARA, CA 93107-2718
PO BOX 12719, SANTA BARBARA, CA 93107-2719
PO BOX 12720, SANTA BARBARA, CA 93107-2720
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