1. OCEANSIDE 35 post offices
--1046 MISSION AVE, 92054, OCEANSIDE CA details
--211 BROOKS ST, 92054, OCEANSIDE CA details
--517 SEAGAZE DR, 92054, OCEANSIDE CA details
--1895 AVENIDA DEL ORO, 92056, OCEANSIDE CA details
--3774 MISSION AVE, 92058, OCEANSIDE CA details
--845 COLLEGE BLVD, 92057, OCEANSIDE CA details
--2701 VISTA WAY, 92054, OCEANSIDE CA details
--4176 OCEANSIDE BLVD, 92056, OCEANSIDE CA details
--3470 MARRON RD, 92056, OCEANSIDE CA details
--2150 VISTA WAY, 92054, OCEANSIDE CA details
--1702 OCEANSIDE BLVD, 92054, OCEANSIDE CA details
--3533 CANNON RD, 92056, OCEANSIDE CA details
--4251 OCEANSIDE BLVD, 92056, OCEANSIDE CA details
--101 OLD GROVE RD, 92057, OCEANSIDE CA details
--3450 MARRON RD, 92056, OCEANSIDE CA details
--4150 OCEANSIDE BLVD, 92056, OCEANSIDE CA details
--3925 MISSION AVE, 92058, OCEANSIDE CA details
--1036 MISSION AVE, 92054, OCEANSIDE CA details
--845 COLLEGE BLVD, 92057, OCEANSIDE CA details
--1702 OCEANSIDE BLVD, 92054, OCEANSIDE CA details
--3760 MISSION AVE, 92058, OCEANSIDE CA details
--1706 OCEANSIDE BLVD, 92054, OCEANSIDE CA details
--4615 FRAZEE RD, 92057, OCEANSIDE CA details
--1980 COLLEGE BLVD, 92056, OCEANSIDE CA details
--3925 N RIVER RD, 92058, OCEANSIDE CA details
--1 BARNARD DR, 92056, OCEANSIDE CA details
--3770 MISSION AVE, 92058, OCEANSIDE CA details
--2170 VISTA WAY, 92054, OCEANSIDE CA details
--3507 CANNON RD, 92056, OCEANSIDE CA details
--3752 MISSION AVE, 92058, OCEANSIDE CA details
--4181 OCEANSIDE BLVD, 92056, OCEANSIDE CA details
--705 COLLEGE BLVD, 92057, OCEANSIDE CA details
--2100 VISTA WAY, 92054, OCEANSIDE CA details
--3405 MARRON RD, 92056, OCEANSIDE CA details
--1046 MISSION AVE, 92054, OCEANSIDE CA details


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2. OAKLAND 66 post offices
--3010 E 9TH ST, 94601, OAKLAND CA details
--8495 PARDEE DR, 94621, OAKLAND CA details
--1301 CLAY ST, 94612, OAKLAND CA details
--201 13TH ST OFC, 94612, OAKLAND CA details
--2226 MACARTHUR BLVD, 94602, OAKLAND CA details
--8033 MACARTHUR BLVD, 94605, OAKLAND CA details
--1445 34TH AVE, 94601, OAKLAND CA details
--490 LAKE PARK AVE, 94610, OAKLAND CA details
--3630 HIGH ST, 94619, OAKLAND CA details
--9201 INTERNATIONAL BLVD, 94603, OAKLAND CA details
--1954 MOUNTAIN BLVD, 94611, OAKLAND CA details
--4900 SHATTUCK AVE, 94609, OAKLAND CA details
--577 W GRAND AVE, 94612, OAKLAND CA details
--1675 7TH ST RM 100 10M, 94615, OAKLAND CA details
--4123 BROADWAY, 94611, OAKLAND CA details
--388 9TH ST STE 108, 94607, OAKLAND CA details
--1675 7TH ST, 94615, OAKLAND CA details
--1675 7TH ST RM 236, 94615, OAKLAND CA details
--195 41ST ST, 94611, OAKLAND CA details
--1675 7TH ST RM 405, 94615, OAKLAND CA details
--3747 GRAND AVE, 94610, OAKLAND CA details
--4100 REDWOOD RD, 94619, OAKLAND CA details
--2096 MOUNTAIN BLVD, 94611, OAKLAND CA details
--5130 BROADWAY, 94611, OAKLAND CA details
--3550 FRUITVALE AVE, 94602, OAKLAND CA details
--3348 LAKESHORE AVE, 94610, OAKLAND CA details
--1221 BROADWAY, 94612, OAKLAND CA details
--3450 FRUITVALE AVE, 94602, OAKLAND CA details
--151 40TH ST, 94611, OAKLAND CA details
--2220 MOUNTAIN BLVD, 94611, OAKLAND CA details
--2040 FRANKLIN ST, 94612, OAKLAND CA details
--433 HEGENBERGER RD STE 110, 94621, OAKLAND CA details
--3010 E 9TH ST, 94601, OAKLAND CA details
--344 THOMAS L BERKLEY WAY, 94612, OAKLAND CA details
--1998 MOUNTAIN BLVD, 94611, OAKLAND CA details
--1901 HARRISON ST, 94612, OAKLAND CA details
--171 12TH ST, 94607, OAKLAND CA details
--3242 GRAND AVE, 94610, OAKLAND CA details
--333 HEGENBERGER RD, 94621, OAKLAND CA details
--5130 BROADWAY, 94611, OAKLAND CA details
--1 AIRPORT DR, 94621, OAKLAND CA details
--3711 MACARTHUR BLVD, 94619, OAKLAND CA details
--901 FRANKLIN ST STE 88, 94607, OAKLAND CA details
--3236 LAKESHORE AVE, 94610, OAKLAND CA details
--5100 BROADWAY, 94611, OAKLAND CA details
--7200 BANCROFT AVE, 94605, OAKLAND CA details
--175 41ST ST, 94611, OAKLAND CA details
--3320 FRUITVALE AVE, 94602, OAKLAND CA details
--4100 REDWOOD RD, 94619, OAKLAND CA details
--2000 MOUNTAIN BLVD, 94611, OAKLAND CA details
--344 THOMAS L BERKLEY WAY, 94612, OAKLAND CA details
--450 30TH ST RM 2710, 94609, OAKLAND CA details
--900 FALLON ST, 94607, OAKLAND CA details
--12500 CAMPUS DR, 94619, OAKLAND CA details
--5000 MACARTHUR BLVD, 94613, OAKLAND CA details
--3500 MOUNTAIN BLVD, 94619, OAKLAND CA details
--230 BAY PL, 94612, OAKLAND CA details
--3434 HIGH ST, 94619, OAKLAND CA details
--3232 FOOTHILL BLVD, 94601, OAKLAND CA details
--5055 TELEGRAPH AVE, 94609, OAKLAND CA details
--3400 TELEGRAPH AVE, 94609, OAKLAND CA details
--8102 INTERNATIONAL BLVD, 94621, OAKLAND CA details
--3250 LAKESHORE AVE STE B, 94610, OAKLAND CA details
--301 E 18TH ST, 94606, OAKLAND CA details
--1333 BROADWAY, 94612, OAKLAND CA details
--8400 EDGEWATER DR, 94621, OAKLAND CA details


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3. ONTARIO 25 post offices
--2205 S GROVE AVE, 91761, ONTARIO CA details
--1555 E HOLT BLVD, 91761, ONTARIO CA details
--1126 N MOUNTAIN AVE, 91762, ONTARIO CA details
--123 W HOLT BLVD, 91762, ONTARIO CA details
--240 N EUCLID AVE, 91762, ONTARIO CA details
--2500 S GROVE AVE, 91761, ONTARIO CA details
--4240 E 4TH ST, 91764, ONTARIO CA details
--1000 N MOUNTAIN AVE, 91762, ONTARIO CA details
--921 N MILLIKEN AVE, 91764, ONTARIO CA details
--2205 S GROVE AVE, 91761, ONTARIO CA details
--333 N EUCLID AVE, 91762, ONTARIO CA details
--4261A INLAND EMPIRE BLVD, 91764, ONTARIO CA details
--2280 S GROVE AVE, 91761, ONTARIO CA details
--3075 S ARCHIBALD AVE, 91761, ONTARIO CA details
--2246 S EUCLID AVE, 91762, ONTARIO CA details
--3075 S ARCHIBALD AVE BLDG C, 91761, ONTARIO CA details
--2456 S GROVE AVE, 91761, ONTARIO CA details
--2238 S EUCLID AVE STE A, 91762, ONTARIO CA details
--320 E D ST, 91764, ONTARIO CA details
--646 W HOLT BLVD, 91762, ONTARIO CA details
--1105 W PHILADELPHIA ST, 91762, ONTARIO CA details
--1939 E 4TH ST, 91764, ONTARIO CA details
--2950 S ARCHIBALD AVE, 91761, ONTARIO CA details
--2245 S EUCLID AVE, 91762, ONTARIO CA details
--1333 N MOUNTAIN AVE, 91762, ONTARIO CA details


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4. OXNARD 26 post offices
--2628 SAVIERS RD, 93033, OXNARD CA details
--350 S A ST, 93030, OXNARD CA details
--1961 N C ST, 93036, OXNARD CA details
--2532 SAVIERS RD, 93033, OXNARD CA details
--450 S VENTURA RD, 93030, OXNARD CA details
--2101 N ROSE AVE, 93036, OXNARD CA details
--1291 S VICTORIA AVE, 93035, OXNARD CA details
--1700 E GONZALES RD, 93036, OXNARD CA details
--2831 SAVIERS RD, 93033, OXNARD CA details
--460 E ESPLANADE DR, 93036, OXNARD CA details
--2628 SAVIERS RD, 93033, OXNARD CA details
--2101 N ROSE AVE, 93036, OXNARD CA details
--3443 SAVIERS RD, 93033, OXNARD CA details
--150 W ESPLANADE DR, 93036, OXNARD CA details
--920 N VENTURA RD, 93030, OXNARD CA details
--2001 E VENTURA BLVD, 93036, OXNARD CA details
--1205 S OXNARD BLVD, 93030, OXNARD CA details
--551 S VENTURA RD, 93030, OXNARD CA details
--2320 N ROSE AVE, 93036, OXNARD CA details
--2303 E VINEYARD AVE, 93036, OXNARD CA details
--2851 S ROSE AVE, 93033, OXNARD CA details
--481 S VENTURA RD, 93030, OXNARD CA details
--1801 N ROSE AVE, 93030, OXNARD CA details
--2001 N ROSE AVE, 93036, OXNARD CA details
--2701 SAVIERS RD, 93033, OXNARD CA details
--421 W ESPLANADE DR, 93036, OXNARD CA details


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5. ORANGE 29 post offices
--1411 N TUSTIN ST, 92867, ORANGE CA details
--3744 E CHAPMAN AVE STE F, 92859, ORANGE CA details
--2683 N ORANGE OLIVE RD, 92857, ORANGE CA details
--1075 N TUSTIN ST, 92863, ORANGE CA details
--308 W CHAPMAN AVE, 92856, ORANGE CA details
--146 S MAIN ST STE L, 92868, ORANGE CA details
--2684 N TUSTIN ST, 92865, ORANGE CA details
--170 S MAIN ST, 92868, ORANGE CA details
--2535 N TUSTIN ST, 92865, ORANGE CA details
--8540 E CHAPMAN AVE, 92869, ORANGE CA details
--330 S MAIN ST, 92868, ORANGE CA details
--2050 N TUSTIN ST, 92865, ORANGE CA details
--1411 N TUSTIN ST, 92867, ORANGE CA details
--8440 E CHAPMAN AVE, 92869, ORANGE CA details
--2620 E CHAPMAN AVE, 92869, ORANGE CA details
--1435 W CHAPMAN AVE, 92868, ORANGE CA details
--940 N TUSTIN ST, 92867, ORANGE CA details
--8440 E CHAPMAN AVE, 92869, ORANGE CA details
--4550 E CHAPMAN AVE, 92869, ORANGE CA details
--4040 E CHAPMAN AVE, 92869, ORANGE CA details
--480 S MAIN ST, 92868, ORANGE CA details
--1535 E KATELLA AVE, 92867, ORANGE CA details
--2138 N TUSTIN ST, 92865, ORANGE CA details
--386 N CENTER ST, 92866, ORANGE CA details
--150 W SYCAMORE AVE, 92866, ORANGE CA details
--3325 E CHAPMAN AVE, 92869, ORANGE CA details
--1800 E COLLINS AVE, 92867, ORANGE CA details
--1538 E CHAPMAN AVE, 92866, ORANGE CA details
--2300 N TUSTIN ST, 92865, ORANGE CA details


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6. O NEALS 1 post office

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7. OAK RUN 1 post office

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8. OAK VIEW 1 post office

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9. OAKDALE 6 post offices
--170 CALIFORNIA AVE, 95361, OAKDALE CA details
--17631 SONORA RD, 95361, OAKDALE CA details
--346 E F ST, 95361, OAKDALE CA details
--105 W F ST, 95361, OAKDALE CA details
--1520 E F ST, 95361, OAKDALE CA details
--444 W F ST, 95361, OAKDALE CA details


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10. OAKHURST 5 post offices
--40064 HIGHWAY 49, 93644, OAKHURST CA details
--40044 HIGHWAY 49, 93644, OAKHURST CA details
--40041 HIGHWAY 49 Nbr 367, 93644, OAKHURST CA details
--40044 HIGHWAY 49, 93644, OAKHURST CA details
--40044 HIGHWAY 49, 93644, OAKHURST CA details


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11. OAKLEY 2 post offices
--400 DEL ANTICO AVE, 94561, OAKLEY CA details
--2170 MAIN ST, 94561, OAKLEY CA details


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12. OAKVILLE 1 post office

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13. OCCIDENTAL 1 post office

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14. OCEANO 1 post office

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15. OCOTILLO 1 post office

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16. OJAI 3 post offices
--201 E OJAI AVE, 93023, OJAI CA details
--1127 MARICOPA HWY, 93023, OJAI CA details
--202 E MATILIJA ST, 93023, OJAI CA details


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17. OLANCHA 1 post office

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18. OLD STATION 1 post office

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19. OLEMA 1 post office

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20. OLIVEHURST 1 post office

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21. ONYX 1 post office

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22. ORANGE COVE 1 post office

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23. ORANGEVALE 7 post offices
--6261 HAZEL AVE, 95662, ORANGEVALE CA details
--9267 GREENBACK LN STE C5, 95662, ORANGEVALE CA details
--9407 MADISON AVE, 95662, ORANGEVALE CA details
--8701 GREENBACK LN, 95662, ORANGEVALE CA details
--8861 GREENBACK LN, 95662, ORANGEVALE CA details
--8900 GREENBACK LN, 95662, ORANGEVALE CA details
--8961 GREENBACK LN, 95662, ORANGEVALE CA details


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24. OREGON HOUSE 1 post office

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25. ORINDA 5 post offices
--29 ORINDA WAY, 94563, ORINDA CA details
--2 CAMINO SOBRANTE, 94563, ORINDA CA details
--80 MORAGA WAY, 94563, ORINDA CA details
--1 CAMINO SOBRANTE, 94563, ORINDA CA details
--50 MORAGA WAY, 94563, ORINDA CA details


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26. ORLAND 3 post offices
--831 4TH ST, 95963, ORLAND CA details
--869 NEWVILLE RD, 95963, ORLAND CA details
--828 NEWVILLE RD, 95963, ORLAND CA details


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27. ORLEANS 1 post office

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28. ORO GRANDE 1 post office

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29. OROSI 1 post office

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30. OROVILLE 10 post offices
--1735 ROBINSON ST, 95965, OROVILLE CA details
--2359 MYERS ST STE D, 95966, OROVILLE CA details
--11300A MILLER FLAT RD, 95965, OROVILLE CA details
--2325 MYERS ST STE A, 95966, OROVILLE CA details
--2150 FEATHER RIVER BLVD, 95965, OROVILLE CA details
--2111 ORO DAM BLVD E, 95966, OROVILLE CA details
--2325 MYERS ST, 95966, OROVILLE CA details
--1074 ORO DAM BLVD E, 95965, OROVILLE CA details
--2703 ORO DAM BLVD E, 95966, OROVILLE CA details
--355 ORO DAM BLVD E, 95965, OROVILLE CA details


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31. ORICK 1 post office

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32. OAK HILLS 1 post office

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33. OAK PARK 1 post office

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34. ORCUTT 1 post office

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Total # of Post Offices: 243 (click on any link above to check post office Open Hours)

Note: Some locations beside Open hours do include info about: Passport Acceptance Hour,Passport Photo Hours,PO Box Access Hours,Carrier Facility Hours, Global Express Guaranteed Hours,Pickup Services Hours.