As of January 27, 2019:
| Product Letters (1 oz.) Letters additional ounces Letters (metered 1 oz.) International Letters (1 oz.) Domestic Postcards |
Price 55¢ 15¢ 50¢ $1.15 35¢ |
The domestic Priority Mail Retail Flat Rate price changes are:
| Product Small Flat Rate Box Medium Flat Rate Box Large Flat Rate Box APO/FPO Large Flat Rate Box Regular Flat Rate Envelope Legal Flat Rate Envelope Padded Flat Rate Envelope |
Price $7.90 $14.35 $19.95 $18.45 $7.35 $7.65 $8.00 |
Here’s a summary of first-class rates: 
One major change is in “First-Class Package Service—Retail,” which the USPS calls “a lightweight expedited offering used primarily by businesses for fulfillment purposes.” It includes tracking, at about half the cost of Priority Mail. However, it is not easy to produce a table for this service, because the rate now ranges from $3.66 to $4.06 for up to four ounces, depending on distance. The service includes tracking.
To determine a domestic zone, use this tool on the USPS website. Choose the second tab, “Get Zone for ZIP Code Pair.” 
Thank you to VSC member Foster E. Miller III for his help on this article.
Really weird that USPS would have all the rates end in a multiple of 5c, yet have one service where that isn’t the case. Ah, USPS, never change 🙂
Dear sir,
Do you have a revised table for Year 2020?
Thanks!
Lawrence
Sorry, Lawrence. I have the pieces and have to put it together. It’s overdue.
The revised chart is now at U.S. Postal Rates (2020). I haven’t had a chance to add it to the Front Page yet.