The following census indexes are provided for your help. More will be added asap! I have included names that I feel may be good possibilites as McElyea. These will be marked with an asterisk.
Alabama 1840
| Name | County | Page | Township |
| McElvy, John * | Lauderdale | 099 | No Twp L |
| McElyea, Hiram | Jackson | 053 | No Twp L |
| McElyea, Hugh | Jackson | 048 | No Twp L |
| McElyea,Jesse | Jackson | 050 | No Twp L |
| McElys, George N.* | Madison | 136 | No Twp L |
Alabama 1850
| Name | County | Page | Township |
| McEaly, Joseph * | Montgomery | 141 | Montgomery |
| McEley, Francis * | Russell | 079 | No Twp. listed |
| McElyea, James G. | Jackson | 133 | District |
| McElyea, William C. | Jackson | 125 | District |
Alabama 1860
| Name | County | Page | Township |
| McElerly, Henry * | Jackson | 308 | Division No. |
| McElerly, Malissa* | Jackson | 308 | Division No. |
| McElizia, P.H.* | Jackson | 633 | District No. |
| McElry, J.R. * | Tallaposs | 137 | Tehopeka |
| McElvey, George W.* | Lauderdale | 069 | District No. |
| McElvie, John * | Lauderdale | 066 | District No. |
| McElvie, Samuel * | Lauderdale | 065 | District No. |
| McElyea, Elenor | Madison | 260 | Hayes Store |
| McElyea, Fred | Madison | 273 | Hayes Store |
| McElyea, Hugh | Jackson | 508 | Twp 3 Range |
| McElyea, John | Madison | 304 | Hayes Store |
| McElyea, Melinda | Jackson | 508 | Twp 3 Range |
| McElyea, Polly | Jackson | 508 | Twp 3 Range |
| McElyea, William H. | Lauderdale | 015 | District No. |
Alabama 1870
| Name | County | State | Page | Township | Year |
| McKelay, Isabel* | Jackson | Alabama | 221 | Hillians Store P.O. | 1870 |
| McKelay, Jessie* | Lauderdale | Alabama | 550 | Waterloo P.O. | 1870 |
| McElry, Daniel* | Calhoun | Alabama | 560 | White Planis P.O. | 1870 |
| McElyea, Andy J. | Jackson | Alabama | 201 | Larkinsville P.O. | 1870 |
| McElyea, Ashby | Lauderdale | Alabama | 442 | Green Hill P.O. | 1870 |
| McElyea, David A. | Limestone | Alabama | 054 | Athens P.O. | 1870 |
| McElyea, F.F. | Madison | Alabama | 245 | New Market P.O. | 1870 |
| McElyea, Henry | Jackson | Alabama | 092 | Big Coon P.O. | 1870 |
| McElza, Jack* | Jackson | Alabama | 064 | Scottsboro P.O. | 1870 |
| McLemon, William * | Limestone | Alabama | 175 | Athens P.O. |
Names with an asterisk are presumed to be McElyea. It has been proven that Jack McElza is Isaac McElyea. Also proven is that William McLemon was actually William McElyea.
Illinois 1850
| Name | County | Page | Township |
| McElyea, Alonzo | Franklin | 023 | NC Twp L |
| McElyea, Anda | Franklin | 021 | NC Twp L |
| McElyea, Elizabeth | Union | 157 | W Pt 2nd |
| McElyea, Hugh | Union | 156 | W Pt 2nd |
| McElyea, Rhoda | Franklin | 023 | NC Twp L |
| McElyea, William | Franklin | 033 | NC Twp L |
| McElyeo, Elizabeth* | Union | 157 | W Pt 2nd |
| McElyea, Hugh | Union | 156 | W Pt 2nd |
Tennessee 1840
| Name | County | Page | Township |
| McElyea, Abraham | Humphrey | 230 | District |
| McElyea, Humphrey | Wayne | 073 | No Twp L |
| McElyea, Isaac | Franklin | 039 | No Twp L |
| McElyea, John | Obion | 147 | No Twp L |
| McElyea, Larkin | Johnson | 272 | No Twp L |
| McElyed, Perry * | Obion | 147 | No Twp L |
| McElyra, Daniel * | Humphrey | 219 | No Twp L |
| McElyra, John * | Wayne | 073 | No Twp L |