If you are looking for clark county utilities oh, please check our official links below: Clark County Utilities Department https://www.clarkcountyohio.gov/168/Utilities Online Payments | Clark County, OH - Official Website https://www.clarkcountyohio.gov/113/Pay-Bills-Online Water or Sewer Payments. Pay by credit/debit card online or contact Paymentus toll free at 844-215-6938. Real Estate Tax Payments....