Police departments in the United States use various handgun models, with some of the most common being:
Glock pistols are extremely popular, particularly the Glock 17 (9mm) and Glock 22 (.40 S&W). Many departments have switched to 9mm models in recent years, including the Glock 19 and Glock 17.
SIG Sauer is another major supplier, with the P320 gaining significant adoption after being selected as the U.S. military's M17/M18 service pistol. The P226 and P229 models have long been used by many departments.
Smith & Wesson's M&P (Military and Police) line is widely used, especially the M&P 9mm and M&P .40 models.
Other common police handguns include the FN 509, Beretta 92 series (especially the 92FS/M9), and various models from manufacturers like Heckler & Koch, Walther, and CZ.