Here is an official description of the Heart of America Newfoundland Club's Regional Area:
The Club exists principally to serve the Newfoundland dog and Newfoundland fanciers in Kansas, Western Missouri, Northeastern Oklahoma, Southwestern Iowa and Southeastern Nebraska.
This region is defined as follows: Kansas – all counties, Western Missouri – Schuyler, Adair, Macon, Randolph, Howard, Cooper, Moniteau, Morgan, Camden, Laclede, Wright, Douglas, Ozark counties and all counties west to state lines;
Southeastern Nebraska – Cass, Cuming, Dodge, Douglas, Franklin, Gage, Johnson, Lancaster, Nemaha, Otoe, Pawnee, Richardson, Sarpy, Saunders, and Washington counties;
Southwestern Iowa – Adair, Adams, Appanoose, Boone, Cass, Clarke, Decatur, Fremont, Jasper, Lucas, Madison, Marion, Mills, Monroe, Montgomery, Page, Polk, Pottawattamie, Ringgold, Taylor, Union, Warren, and Wayne counties;
Northeastern Oklahoma – Adair, Cherokee, Craig, Creek, Delaware, Kay, Mayes, Muskogee, Noble, Nowata, Okmulgee, Osage, Ottawa, Pawnee, Payne, Rogers, Sequoyeh, Tulsa, Wagoner, and Washington counties