WM
William Mccoy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Duval-County, Florida
Our Model Tree links this William Mccoy across the 1930 and 1940 US Censuses in Duval-County, Florida (XGBoost, ~Confirmed) — first a son (b.~1928), then head of a 9-person household.
Age 12
b. ~1928
Male
Son
Born: Florida
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Duval-County, Florida |
| Surname | McCoy |
| Given Name | William H. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Florida |
| 1935 Residence (City) | Jacksonville City |
| 1935 Residence (County) | Duval |
| Additional Details | |
| Highest Grade | No 6 |
| 1935 Residence | Same Place |
| Birth State | Florida |
| Birth Country | United States |
| Birthplace (normalized) | florida |
| Township / Ward | Jacksonville City |
| Est. Birth Year | ~1928 |
Household Members
Census records only state relationship to the household head.
Pairwise kinship is derived (~90–95% accurate), not recorded.
Step/blended families and boarders can break it.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Edward Mccoy | Son | — | 5 | ~1935 |
| Thelma Mccoy | Daughter | — | 8 | ~1932 |
| Ann Mccoy | Daughter | — | 6 | ~1934 |
| William Mccoy | Son | — | 12 | ~1928 |
| William Mccoy | Head | — | 37 | ~1903 |
| Thelma Mccoy | Spouse | — | 35 | ~1905 |
| Martha Mccoy | Daughter | — | 3 | ~1937 |
| Margaret Mccoy | Daughter | — | 10 | ~1930 |
| John Mccoy | Son | — | 1 | ~1939 |
Census Appearances
1930
Duval, Florida
Son, age 1
Duval, Florida · implied b. ~1929 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCoy |
| Given Name | Willie M Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Florida |
| Father's Birthplace | Florida |
| Mother's Birthplace | Florida |
| Birth State | Florida |
| Birth Country | United States |
| Birthplace (normalized) | florida |
1940
Duval-County, Florida
Son, age 12
Duval-County, Florida · implied b. ~1928 — 9 household members
| Surname | McCoy |
| Given Name | William H. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Florida |
| 1935 Residence (City) | Jacksonville City |
| 1935 Residence (County) | Duval |
| Highest Grade | No 6 |
| 1935 Residence | Same Place |
| Birth State | Florida |
| Birth Country | United States |
| Birthplace (normalized) | florida |
Model Tree
An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Our Model Tree links William Mccoy across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Mccoy
Son · 1940 · age 12 · b. ~1928 · Florida
★ You are viewing this record
Sibling
Edward Mccoy
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ann Mccoy
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thelma Mccoy
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Martha Mccoy
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Mccoy
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Mccoy
Sibling · 1940 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Duval-County, Florida
Open full size
1940 US Federal Census — Duval-County, Florida
Page Contents
38 people indexed on this census page (nara:1940:m-t0627-00627-01082)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John H. Mcduffie | 46 | Head | Promoter | Canada |
| 2 | Margaret H. Mcduffie | 43 | Wife | Teacher | Illinois |
| 3 | John H. Jr. Mcduffie | 19 | Son | — | Florida |
| 4 | Mary J. Mcduffie | 17 | Daughter | — | Florida |
| 6 | William H. Mccoy | 37 | Head | Lawyer | Connecticut |
| 7 | Thelma Mccoy | 35 | Wife | — | Maryland |
| 8 | William H. Jr. Mccoy THIS PERSON | 12 | Son | — | Florida |
| 9 | Margaret Mccoy | 10 | Daughter | — | Florida |
| 10 | Thelma Mccoy | 8 | Daughter | — | Florida |
| 11 | Ann Mccoy | 6 | Daughter | — | Florida |
| 12 | Edward Mccoy | 5 | Son | — | Florida |
| 13 | Martha Mccoy | 3 | Daughter | — | Florida |
| 14 | John Mccoy | 1 | Son | — | Florida |
| 15 | Joseph L. Watson | 39 | Head | Vice President | Georgia |
| 16 | Margaret Watson | 33 | Wife | — | Alabama |
| 17 | Joseph Jr. Watson | 13 | Son | — | Georgia |
| 18 | Lucy Watson | 12 | Daughter | — | Georgia |
| 19 | Lillian M. Moore | 39 | Head | — | Tennessee |
| 20 | Stroude Moore | 10 | Niece | — | Tennessee |
| 21 | Joe Jr. Matthews | 33 | Brother | — | Tennessee |
| 22 | John H. Denmark | 50 | Head | Owner | Florida |
| 23 | Georgia Denmark | 47 | Wife | — | Georgia |
| 24 | Herbert Denmark | 25 | Son | Salesman | Florida |
| 25 | Barbara Jean Denmark | 9 | Daughter | — | Florida |
| 26 | Viola Thomas | 30 | Servant | Maid | Georgia |
| 27 | John D. Aldridge | 49 | Head | Owner | Georgia |
| 28 | Lessie Aldridge | 42 | Wife | — | Georgia |
| 29 | Chandler H. Smith | 39 | Head | Owner | Florida |
| 30 | Freddie Lou Smith | 32 | Wife | — | Georgia |
| 31 | Mary Moore Smith | 3 | Daughter | — | Florida |
| 32 | Freddie Lou Smith | 1 | Daughter | — | Florida |
| 34 | David Rathbun | 26 | Head | Manager | Florida |
| 35 | Mildred Rathbun | 22 | Wife | — | Florida |
| 36 | Barbara Ann Rathbun | 1 | Daughter | — | Florida |
| 37 | Lingle L. Lonn | 40 | Head | Salesman | Georgia |
| 38 | Katherine Lonn | 38 | Wife | — | Georgia |
| 39 | William H. Reese | 20 | Brother in Law | — | Georgia |
| 40 | Hilma L. Knight | 53 | Sister | Registered Nurse | Georgia |
Related Census Records
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.
Source: National Archives and Records Administration (NARA)