what is the most runs scored in a mlb game by one team

The most runs scored by one team in an MLB game is 36, by the Chicago Colts (now the Cubs) against the Louisville Colonels on June 29, 1897. In the modern era, the record is 30 runs by the Texas Rangers against the Baltimore Orioles on August 22, 2007.

Extra context

The highest-scoring MLB game overall was Cubs 26, Phillies 23 on August 25, 1922, for a combined 49 runs. That game is often mentioned alongside the one- team record, but it is a separate stat because it measures total runs by both teams, not just one side.

Fast fact

• One-team MLB record: 36 runs.
• Modern-era one-team record: 30 runs.
• Highest total in a game: 49 runs.

TL;DR: 36 runs is the all-time one-team MLB record, and 30 runs is the modern-era mark.