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 2011, MORRISVILLE, PA 19067-0511
PO BOX 2012, MORRISVILLE, PA 19067-0512
PO BOX 2013, MORRISVILLE, PA 19067-0513
PO BOX 2014, MORRISVILLE, PA 19067-0514
PO BOX 2015, MORRISVILLE, PA 19067-0515
PO BOX 2016, MORRISVILLE, PA 19067-0516
PO BOX 2017, MORRISVILLE, PA 19067-0517
PO BOX 2018, MORRISVILLE, PA 19067-0518
PO BOX 2019, MORRISVILLE, PA 19067-0519
PO BOX 2020, MORRISVILLE, PA 19067-0520
PO BOX 2021, MORRISVILLE, PA 19067-0521
PO BOX 2022, MORRISVILLE, PA 19067-0522
PO BOX 2023, MORRISVILLE, PA 19067-0523
PO BOX 2024, MORRISVILLE, PA 19067-0524
PO BOX 2025, MORRISVILLE, PA 19067-0525
PO BOX 2026, MORRISVILLE, PA 19067-0526
PO BOX 2027, MORRISVILLE, PA 19067-0527
PO BOX 2028, MORRISVILLE, PA 19067-0528
PO BOX 2029, MORRISVILLE, PA 19067-0529
PO BOX 2030, MORRISVILLE, PA 19067-0530
PO BOX 2031, MORRISVILLE, PA 19067-0531
PO BOX 2032, MORRISVILLE, PA 19067-0532
PO BOX 2033, MORRISVILLE, PA 19067-0533
PO BOX 2034, MORRISVILLE, PA 19067-0534
PO BOX 2035, MORRISVILLE, PA 19067-0535
PO BOX 2036, MORRISVILLE, PA 19067-0536
PO BOX 2037, MORRISVILLE, PA 19067-0537
PO BOX 2038, MORRISVILLE, PA 19067-0538
PO BOX 2039, MORRISVILLE, PA 19067-0539
PO BOX 2040, MORRISVILLE, PA 19067-0540
PO BOX 2041, MORRISVILLE, PA 19067-0541
PO BOX 2042, MORRISVILLE, PA 19067-0542
PO BOX 2043, MORRISVILLE, PA 19067-0543
PO BOX 2044, MORRISVILLE, PA 19067-0544
PO BOX 2045, MORRISVILLE, PA 19067-0545
PO BOX 2046, MORRISVILLE, PA 19067-0546
PO BOX 2047, MORRISVILLE, PA 19067-0547
PO BOX 2048, MORRISVILLE, PA 19067-0548
PO BOX 2049, MORRISVILLE, PA 19067-0549
PO BOX 2050, MORRISVILLE, PA 19067-0550
PO BOX 2051, MORRISVILLE, PA 19067-0551
PO BOX 2052, MORRISVILLE, PA 19067-0552
PO BOX 2053, MORRISVILLE, PA 19067-0553
PO BOX 2054, MORRISVILLE, PA 19067-0554
PO BOX 2055, MORRISVILLE, PA 19067-0555
PO BOX 2056, MORRISVILLE, PA 19067-0556
PO BOX 2057, MORRISVILLE, PA 19067-0557
PO BOX 2058, MORRISVILLE, PA 19067-0558
PO BOX 2059, MORRISVILLE, PA 19067-0559
PO BOX 2060, MORRISVILLE, PA 19067-0560
PO BOX 2061, MORRISVILLE, PA 19067-0561
PO BOX 2062, MORRISVILLE, PA 19067-0562
PO BOX 2063, MORRISVILLE, PA 19067-0563
PO BOX 2064, MORRISVILLE, PA 19067-0564
PO BOX 2065, MORRISVILLE, PA 19067-0565
PO BOX 2066, MORRISVILLE, PA 19067-0566
PO BOX 2067, MORRISVILLE, PA 19067-0567
PO BOX 2068, MORRISVILLE, PA 19067-0568
PO BOX 2069, MORRISVILLE, PA 19067-0569
PO BOX 2070, MORRISVILLE, PA 19067-0570
PO BOX 2071, MORRISVILLE, PA 19067-0571
PO BOX 2072, MORRISVILLE, PA 19067-0572
PO BOX 2073, MORRISVILLE, PA 19067-0573
PO BOX 2074, MORRISVILLE, PA 19067-0574
PO BOX 2075, MORRISVILLE, PA 19067-0575
PO BOX 2076, MORRISVILLE, PA 19067-0576
PO BOX 2077, MORRISVILLE, PA 19067-0577
PO BOX 2078, MORRISVILLE, PA 19067-0578
PO BOX 2079, MORRISVILLE, PA 19067-0579
PO BOX 2080, MORRISVILLE, PA 19067-0580
PO BOX 2081, MORRISVILLE, PA 19067-0581
PO BOX 2082, MORRISVILLE, PA 19067-0582
PO BOX 2083, MORRISVILLE, PA 19067-0583
PO BOX 2084, MORRISVILLE, PA 19067-0584
PO BOX 2085, MORRISVILLE, PA 19067-0585
PO BOX 2086, MORRISVILLE, PA 19067-0586
PO BOX 2087, MORRISVILLE, PA 19067-0587
PO BOX 2088, MORRISVILLE, PA 19067-0588
PO BOX 2089, MORRISVILLE, PA 19067-0589
PO BOX 2090, MORRISVILLE, PA 19067-0590
PO BOX 2091, MORRISVILLE, PA 19067-0591
PO BOX 2092, MORRISVILLE, PA 19067-0592
PO BOX 2093, MORRISVILLE, PA 19067-0593
PO BOX 2094, MORRISVILLE, PA 19067-0594
PO BOX 2095, MORRISVILLE, PA 19067-0595
PO BOX 2096, MORRISVILLE, PA 19067-0596
PO BOX 2097, MORRISVILLE, PA 19067-0597
PO BOX 2098, MORRISVILLE, PA 19067-0598
PO BOX 2099, MORRISVILLE, PA 19067-0599
PO BOX 2100, MORRISVILLE, PA 19067-0600
PO BOX 2101, MORRISVILLE, PA 19067-0601
PO BOX 2102, MORRISVILLE, PA 19067-0602
PO BOX 2103, MORRISVILLE, PA 19067-0603
PO BOX 2104, MORRISVILLE, PA 19067-0604
PO BOX 2105, MORRISVILLE, PA 19067-0605
PO BOX 2106, MORRISVILLE, PA 19067-0606
PO BOX 2107, MORRISVILLE, PA 19067-0607
PO BOX 2108, MORRISVILLE, PA 19067-0608
PO BOX 2109, MORRISVILLE, PA 19067-0609
PO BOX 2110, MORRISVILLE, PA 19067-0610
PO BOX 2111, MORRISVILLE, PA 19067-0611
PO BOX 2112, MORRISVILLE, PA 19067-0612
PO BOX 2113, MORRISVILLE, PA 19067-0613
PO BOX 2114, MORRISVILLE, PA 19067-0614
PO BOX 2115, MORRISVILLE, PA 19067-0615
PO BOX 2116, MORRISVILLE, PA 19067-0616
PO BOX 2117, MORRISVILLE, PA 19067-0617
PO BOX 2118, MORRISVILLE, PA 19067-0618
PO BOX 2119, MORRISVILLE, PA 19067-0619
PO BOX 2120, MORRISVILLE, PA 19067-0620
PO BOX 2121, MORRISVILLE, PA 19067-0621
PO BOX 2122, MORRISVILLE, PA 19067-0622
PO BOX 2123, MORRISVILLE, PA 19067-0623
PO BOX 2124, MORRISVILLE, PA 19067-0624
PO BOX 2125, MORRISVILLE, PA 19067-0625
PO BOX 2126, MORRISVILLE, PA 19067-0626
PO BOX 2127, MORRISVILLE, PA 19067-0627
PO BOX 2128, MORRISVILLE, PA 19067-0628
PO BOX 2129, MORRISVILLE, PA 19067-0629
PO BOX 2130, MORRISVILLE, PA 19067-0630
PO BOX 2131, MORRISVILLE, PA 19067-0631
PO BOX 2132, MORRISVILLE, PA 19067-0632
PO BOX 2133, MORRISVILLE, PA 19067-0633
PO BOX 2134, MORRISVILLE, PA 19067-0634
PO BOX 2135, MORRISVILLE, PA 19067-0635
PO BOX 2136, MORRISVILLE, PA 19067-0636
PO BOX 2137, MORRISVILLE, PA 19067-0637
PO BOX 2138, MORRISVILLE, PA 19067-0638
PO BOX 2139, MORRISVILLE, PA 19067-0639
PO BOX 2140, MORRISVILLE, PA 19067-0640
PO BOX 2141, MORRISVILLE, PA 19067-0641
PO BOX 2142, MORRISVILLE, PA 19067-0642
PO BOX 2143, MORRISVILLE, PA 19067-0643
PO BOX 2144, MORRISVILLE, PA 19067-0644
PO BOX 2145, MORRISVILLE, PA 19067-0645
PO BOX 2146, MORRISVILLE, PA 19067-0646
PO BOX 2147, MORRISVILLE, PA 19067-0647
PO BOX 2148, MORRISVILLE, PA 19067-0648
PO BOX 2149, MORRISVILLE, PA 19067-0649
PO BOX 2150, MORRISVILLE, PA 19067-0650
PO BOX 2151, MORRISVILLE, PA 19067-0651
PO BOX 2152, MORRISVILLE, PA 19067-0652
PO BOX 2153, MORRISVILLE, PA 19067-0653
PO BOX 2154, MORRISVILLE, PA 19067-0654
PO BOX 2155, MORRISVILLE, PA 19067-0655
PO BOX 2156, MORRISVILLE, PA 19067-0656
PO BOX 2157, MORRISVILLE, PA 19067-0657
PO BOX 2158, MORRISVILLE, PA 19067-0658
PO BOX 2159, MORRISVILLE, PA 19067-0659
PO BOX 2160, MORRISVILLE, PA 19067-0660
PO BOX 2161, MORRISVILLE, PA 19067-0661
PO BOX 2162, MORRISVILLE, PA 19067-0662
PO BOX 2163, MORRISVILLE, PA 19067-0663
PO BOX 2164, MORRISVILLE, PA 19067-0664
PO BOX 2165, MORRISVILLE, PA 19067-0665
PO BOX 2166, MORRISVILLE, PA 19067-0666
PO BOX 2167, MORRISVILLE, PA 19067-0667
PO BOX 2168, MORRISVILLE, PA 19067-0668
PO BOX 2169, MORRISVILLE, PA 19067-0669
PO BOX 2170, MORRISVILLE, PA 19067-0670
PO BOX 2171, MORRISVILLE, PA 19067-0671
PO BOX 2172, MORRISVILLE, PA 19067-0672
PO BOX 2173, MORRISVILLE, PA 19067-0673
PO BOX 2174, MORRISVILLE, PA 19067-0674
PO BOX 2175, MORRISVILLE, PA 19067-0675
PO BOX 2176, MORRISVILLE, PA 19067-0676
PO BOX 2177, MORRISVILLE, PA 19067-0677
PO BOX 2178, MORRISVILLE, PA 19067-0678
PO BOX 2179, MORRISVILLE, PA 19067-0679
PO BOX 2180, MORRISVILLE, PA 19067-0680
PO BOX 2181, MORRISVILLE, PA 19067-0681
PO BOX 2182, MORRISVILLE, PA 19067-0682
PO BOX 2183, MORRISVILLE, PA 19067-0683
PO BOX 2184, MORRISVILLE, PA 19067-0684
PO BOX 2185, MORRISVILLE, PA 19067-0685
PO BOX 2186, MORRISVILLE, PA 19067-0686
PO BOX 2187, MORRISVILLE, PA 19067-0687
PO BOX 2188, MORRISVILLE, PA 19067-0688
PO BOX 2189, MORRISVILLE, PA 19067-0689
PO BOX 2190, MORRISVILLE, PA 19067-0690
PO BOX 2191, MORRISVILLE, PA 19067-0691
PO BOX 2192, MORRISVILLE, PA 19067-0692
PO BOX 2193, MORRISVILLE, PA 19067-0693
PO BOX 2194, MORRISVILLE, PA 19067-0694
PO BOX 2195, MORRISVILLE, PA 19067-0695
PO BOX 2196, MORRISVILLE, PA 19067-0696
PO BOX 2197, MORRISVILLE, PA 19067-0697
PO BOX 2198, MORRISVILLE, PA 19067-0698
PO BOX 2199, MORRISVILLE, PA 19067-0699
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