Buy Postage Stamps in Ontario, CA

Post Offices and USPS-authorized retailers where postage stamps are sold in Ontario, CA.

All the locations below sell USPS postage stamps which can be used to mail First Class letters in the United States. We list both official post offices run by the United States Postal Service and retailers which have been authorized by USPS to sell postal products in Ontario.

Need to mail a letter? See Mailboxes and Post Offices in Ontario

Downtown Ontario Post Office

123 W Holt Blvd
Ontario, CA 91762
Downtown Ontario Post Office is a full post office where stamps can be purchased.

Plaza Center Post Office

1126 N Mountain Ave
Ontario, CA 91762
Plaza Center Post Office is a full post office where stamps can be purchased.

Ontario Post Office

1555 E Holt Blvd
Ontario, CA 91761
Ontario Post Office is a full post office where stamps can be purchased.

Stater Bros

1105 W Philadelphia St
Ontario, CA 91762
 
Stater Bros is a USPS-authorized retailer where postage stamps are sold.

CVS

2238 S Euclid Ave Ste A
Ontario, CA 91762
 
CVS is a USPS-authorized retailer where postage stamps are sold.

Food 4 Less

2246 S Euclid Ave
Ontario, CA 91762
 
Food 4 Less is a USPS-authorized retailer where postage stamps are sold.

Stater Bros

646 W Holt Blvd
Ontario, CA 91762
 
Stater Bros is a USPS-authorized retailer where postage stamps are sold.

CVS

2456 S Grove Ave
Ontario, CA 91761
 
CVS is a USPS-authorized retailer where postage stamps are sold.

Office Depot

2205 S Grove Ave
Ontario, CA 91761
 
Office Depot is a USPS-authorized retailer where postage stamps are sold.

Ralphs

3075 S Archibald Ave Bldg C
Ontario, CA 91761
 
Ralphs is a USPS-authorized retailer where postage stamps are sold.

Walgreens

2950 S Archibald Ave
Ontario, CA 91761
 
Walgreens is a USPS-authorized retailer where postage stamps are sold.

Stater Bros

1939 E 4 Th St
Ontario, CA 91764
 
Stater Bros is a USPS-authorized retailer where postage stamps are sold.

Staples

921 N Milliken Ave
Ontario, CA 91764
 
Staples is a USPS-authorized retailer where postage stamps are sold.

Ontario Village Post Office

1118 W Mission Blvd Ste D
Ontario, CA 91762