RD
Robert Day — 1940 US Census Record
Model Tree available1940 United States Federal Census · Montgomery-County, Maryland
Our Model Tree links this Robert Day across the 1920, 1930 and 1940 US Censuses in Montgomery-County, Maryland (XGBoost, ~Confirmed), with identified parents James & Mary — first a son (b.~1914), then head of a 4-person household.
Age 26
b. ~1914
Male
Son
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Montgomery-County, Maryland |
| Surname | Day |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | 9th Election Dist. |
| 1935 Residence (County) | Montgomery |
| Additional Details | |
| Occupation | Laborer |
| Industry | Nursery |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 86 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Occupation | Laborer |
| Township / Ward | 9Th Election Dist |
| Est. Birth Year | ~1914 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Robert Day | Son | — | 26 | ~1914 |
| Clarence Day | Son | — | 32 | ~1908 |
| Guy Day | Son | — | 21 | ~1919 |
| Rosa Day | Head | — | 58 | ~1882 |
Census Appearances
1920
Montgomery, Maryland
Son, age 6
Montgomery, Maryland · implied b. ~1914 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Day |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Virginia |
| Speaks English | none |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Montgomery, Maryland
Son, age 16
Montgomery, Maryland · implied b. ~1914 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Day |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Can Read/Write | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Montgomery-County, Maryland
Son, age 26
Montgomery-County, Maryland · implied b. ~1914 — 4 household members
| Surname | Day |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | 9th Election Dist. |
| 1935 Residence (County) | Montgomery |
| Occupation | Laborer |
| Industry | Nursery |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 86 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
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 Robert Day across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father James Day (~0.92 confidence) and mother Mary Day (~0.92 confidence) and mother Rosa Day (~0.92 confidence) and mother Ross Day (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
James Day
b. ~1873
Source father
● Household
· direct · ~0.92
Mother
Mary Day
b. ~1882
Source mother
● Household
· direct · ~0.92
Mother
Rosa Day
b. ~1882
Source mother
● Household
· direct · ~0.92
Mother
Ross Day
b. ~1882
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Robert Day
Son · 1940 · age 26 · b. ~1914 · Maryland
★ You are viewing this record
Sibling
Guy Day
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Clarence Day
Sibling · 1940 · age 32
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 — Montgomery-County, Maryland
Open full size
1940 US Federal Census — Montgomery-County, Maryland
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01554-00844)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Leanna Stevenson | 42 | Wife | Teacher | Maryland |
| 42 | Dorothy Stevenson | 19 | Daughter | Unemployed | Maryland |
| 43 | James Stevenson | 18 | Son | Unemployed | Maryland |
| 44 | Ira Stevenson | 27 | Son | Laborer | Maryland |
| 45 | Bettie A. Stevenson | 23 | Daughter in law | — | D. C. |
| 46 | Barbara J. Stevenson | 5 | Granddaughter | — | D. C. |
| 47 | Shirley M. Stevenson | 4 | Granddaughter | — | D. C. |
| 48 | Joseph F. Day | 59 | Head | — | Maryland |
| 49 | Dalma S. Day | 23 | Son | — | Maryland |
| 50 | Reuben F. Day | 23 | Son | — | Maryland |
| 51 | Irving Day | 45 | Son | — | Maryland |
| 52 | Edward Day | 42 | Son | — | Maryland |
| 53 | Eddie Day | 40 | Son | — | Maryland |
| 54 | John Day | 70 | Brother | Laborer | Maryland |
| 55 | Millard May | 36 | Son in law | Janitor | Virginia |
| 56 | Catherine May | 36 | Daughter | — | Maryland |
| 57 | Erich May | 10 | Grandson | — | Maryland |
| 58 | Francis May | 5 | Grandson | — | Maryland |
| 59 | Rosa Day | 58 | Head | — | Virginia |
| 60 | Clarence Day | 32 | Son | Laborer | Maryland |
| 61 | Robert Day THIS PERSON | 26 | Son | Laborer | Maryland |
| 62 | Guy Day | 21 | Son | — | Maryland |
| 63 | Henry Johnson | 65 | Head | Laborer | Maryland |
| 64 | Emily D. Johnson | 53 | Wife | — | Maryland |
| 65 | Rosa Johnson | 30 | Daughter | — | Maryland |
| 66 | Irene Johnson | 27 | Daughter | — | Maryland |
| 67 | Etheleen Johnson | 18 | Daughter | — | Maryland |
| 68 | Harvey Reed | 28 | Head | Laborer | Maryland |
| 69 | Emily Reed | 22 | Wife | — | Maryland |
| 70 | Harvey Jr. Reed | 3 | Son | — | Maryland |
| 71 | Boyd Clinedinst | 30 | Head | In Business | Virginia |
| 72 | Gladys Clinedinst | 28 | Wife | — | Virginia |
| 73 | Dorothy Clinedinst | 10 | Daughter | — | Virginia |
| 74 | Mary Clinedinst | 8 | Daughter | — | Maryland |
| 75 | Anna Clinedinst | 6 | Daughter | — | Maryland |
| 76 | William Smith | 77 | Head | — | Virginia |
| 77 | Mollie Smith | 69 | Wife | — | Tennessee |
| 78 | Albert Smith | 23 | Son | Laborer | Tennessee |
| 79 | Clay Smith | 18 | Son | — | Maryland |
| 80 | Annie Frazier | 52 | Head | — | Maryland |
Pedigree Summary
Robert + 2 siblings
Gen 1 · 4 parents
~0.92
Max depth 4 (1900–1950 window)
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)