CHESAPEAKE UTILITIES CORPORATION EXHIBIT 21 SUBSIDIARIES OF THE REGISTRANT Subsidiaries State Incorporated - ------------ ------------------ Eastern Shore Natural Gas Company Delaware Sharp Energy, Inc. Delaware Chesapeake Service Company Delaware United Systems, Inc. Georgia Tri-County Gas Company, Inc. Maryland Eastern Shore Real Estate Maryland Xeron, Inc. Texas Sam Shannaham Well Co. Maryland Sharp Water, Inc. Delaware Subsidiary of Eastern Shore Natural Gas Company State Incorporated - ----------------------------------------------- ------------------ Dover Exploration Company Delaware Subsidiaries of Sharp Energy, Inc. State Incorporated - ---------------------------------- ------------------ Sharpgas, Inc. Delaware Sharpoil, Inc. Delaware Subsidiaries of Chesapeake Service Company State Incorporated - ------------------------------------------ ------------------ Skipjack, Inc. Delaware Capital Data Systems, Inc. North Carolina Currin and Associates, Inc. North Carolina Chesapeake Investment Company Delaware