Main Industries: Herkimer County is known for producing unusual clear, doubly terminated quartz crystals, marketed as Herkimer diamonds. Ilion in Herkimer County has one of two production sites of the Remington Arms Company, where many of the company's firearms are produced.

Education: Part of the SUNY system, Herkimer County Community College (HCCC) is located in the county.

County Administrator - James W. Wallace, Jr.

• Little Falls, City of
• Columbia, Town of
• Danube, Town of
• Fairfield, Town of
• Frankfort, Town of
  • Frankfort, Village of
• German Flatts, Town of
  • Ilion, Village of
  • Mohawk, Village of
• Herkimer, Town of
  • Herkimer, Village of
• Litchfield, Town of
• Little Falls, Town of
• Manheim, Town of
  • Dolgeville, Village of
• Newport, Town of
  • Middleville, Village of (shared with the Town of Fairfield)
  • Poland, Village of
• Norway, Town of
• Ohio, Town of
• Russia, Town of
  • Coldbrook, Village of
• Salisbury, Town of
• Schuyler, Town of
• Stark, Town of
• Warren, Town of
• Webb, Town of
• Winfield, Town of
  • West Winfield, Village of