The 1820 census introduced a separate category for free white males between the ages of 16 to 18. This category duplicated the information in the 16-26 category. There was no corresponding 16-18 category for females in the household.
| Name | County and page | Gender | 0-10 | 10-16 | 16-18 | 16-26 | 26-45 | 45+ |
|---|---|---|---|---|---|---|---|---|
| Sam'l Isaacks | Adair, 28 | Males | 1 | 1 | ||||
| Females | 1 | XXX | 1 | |||||
| Ann Isaacs | Adair, 30 | Males | ||||||
| Females | ? | XXX | 1 | 1 | ||||
| Jacob Isaacs | Adair, 62 | Males | 1 | |||||
| Females | XXX | |||||||
| Elisha Harrison | Clay, 129 | Males | 2 | 2 | 1 | |||
| Females | 3 | XXX | 1 | |||||
| Isaac Harrison | Clay, 129 | Males | 2 | |||||
| Females | 1 | XXX | 1 | |||||
| Godfrey Isaacs Jr. | Clay, 129 | Males | 4 | 1 | ||||
| Females | 2 | XXX | 1 | |||||
| Godfrey Isaacs Jr. | Clay, 130 | Males | 3 | 1 | ||||
| Females | 1 | XXX | 1 | |||||
| Sam'l Isaacs | Clay, 132 | Males | 1 | 2 | 3 | 1 | ||
| Females | 3 | XXX | 1 | 1 | ||||
| Godfrey Isaacs | Estill, 53 | Males | 3 | 1 | ||||
| Females | 4 | XXX | 1 | |||||
| Carter Lax | Estill, 50 | Males | 1 | |||||
| Females | 3 | XXX | 1 | |||||
| Patrick Johnson | Floyd, 43 | Males | 2 | 1 | ||||
| Females | 3 | XXX | 1 | |||||
| William Isaacs | Floyd, 43 | Males | 2 | 1 | ||||
| Females | 1 | XXX | 1 | |||||
| Jesse Isaacs | Hart, 161 | Males | 1 | 1 | 1 | |||
| Females | 2 | XXX | 1 | |||||
| Samuel Isaacs | Hart, 161 | Males | 1 | |||||
| Females | XXX | 1 | 1 | 1 | ||||
| Martin Gentry Sr. | Madison, 90 | Males | 1 | |||||
| Females | XXX | 1 | ||||||
| Frederick Clemmons | Madison, 134 | Males | 1 | 1 | ||||
| Females | 3 | XXX | 1 | |||||
| John Hunter | Madison, 134 | Males | 1 | 1 | ||||
| Females | 1 | XXX | 1 | |||||
| John Hunter | Madison, 134 | Males | 1 | |||||
| Females | 2 | XXX | 1 | |||||
| James Jennett | Madison, 134 | Males | 1 | 1 | ||||
| Females | 1 | 1 | XXX | 1 | ||||
| Humphrey Jones | Madison, 156 | Males | 3 | 1 | ||||
| Females | 3 | XXX | 1 | 1 | ||||
| Sutten Isaach | Mason, 77 | Males | 1 | |||||
| Females | 1 | XXX | 1 | |||||
| William Y. Isaacs | Pulaski, 49 | Males | 3 | 1 | ||||
| Females | 2 | 1 | XXX | 1 | ||||
| Jesse Isaacks | Shelby, 115 | Males | 2 | 1 | ||||
| Females | XXX | 1 | 1 | |||||
| Elisha Isaacks | Washington, 25 | Males | 2 | 1 | ||||
| Females | 2 | XXX | 1 | |||||
| John Isaacks Jr. | Washington, 22 | Males | 2 | 1 | ||||
| Females | 1 | XXX | 1 | |||||
| John Isaacks Sr. | Washington, 25 | Males | 2 | 3 | 1 | |||
| Females | 4 | XXX | 1 | |||||
| Gabrial Isaacs | Whitney, 118 | Males | 1 | 1 | ||||
| Females | XXX | 1 |