About 75 percent of First-Class Mail will keep its current service standards, according to USPS, and 14 percent will see an improvement in delivery times. Some individuals could experience slower ...

The following is a list of how service standards will be changed, according to the Postal Service fact sheet: Moving from a 3-digit to 3-digit zip code pairing ... A USPS map is available online ...

rather than current standards that are based on 3-Digit ZIP code pairs. USPS already has a map online that will let customers see how long it will take to deliver mail from one ZIP code to another.

The new service standards provide more precise expectations for mailers, as they are based on 5-Digit ZIP code pairs, rather than current standards that are based on 3-Digit ZIP code pairs.

rather than current standards that are based on 3-Digit ZIP code pairs. USPS already has a map online that will let customers see how long it will take to deliver mail from one ZIP code to another.