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Mary Monroe — 1940 US Census Record
Model Tree available1940 United States Federal Census · Peoria-County, Illinois
Our Model Tree links this Mary Monroe across the 1920, 1930 and 1940 US Censuses in Peoria-County, Illinois (XGBoost, ~Confirmed), with identified parents Edward & Mary — first a daughter (b.~1910), then head of a 6-person household.
Age 30
b. ~1910
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Peoria-County, Illinois |
| Surname | Monroe |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Peoria City |
| 1935 Residence (County) | Peoria |
| Additional Details | |
| Occupation | Secretary |
| Industry | Light & Power Co |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1200 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Secretary |
| Township / Ward | Peoria City |
| Est. Birth Year | ~1910 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Alice Grimm | Other | — | 35 | ~1905 |
| Francis Monroe | Daughter | — | 38 | ~1902 |
| Joseph Monroe | Son | — | 26 | ~1914 |
| James Monroe | Son | — | 36 | ~1904 |
| Nellie Monroe | Head | — | 60 | ~1880 |
| Mary Monroe | Daughter | — | 30 | ~1910 |
Census Appearances
1920
Peoria, Illinois
Daughter, age 11
Peoria, Illinois · implied b. ~1909 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Monroe |
| Given Name | Mary E |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Peoria, Illinois
Daughter, age 21
Peoria, Illinois · implied b. ~1909 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Monroe |
| Given Name | Mary C. |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Stenographer |
| Industry | Automobile Insurance |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Peoria-County, Illinois
Daughter, age 30
Peoria-County, Illinois · implied b. ~1910 — 6 household members
| Surname | Monroe |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Peoria City |
| 1935 Residence (County) | Peoria |
| Occupation | Secretary |
| Industry | Light & Power Co |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1200 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 Mary Monroe across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Edward Monroe (~0.92 confidence) and mother Mary Monroe (~0.92 confidence) and mother Nellie Monroe (~0.92 confidence) and mother Nellie Monroe (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Edward Monroe
b. ~1873
Source father
● Household
· direct · ~0.92
Mother
Mary Monroe
b. ~1880
Source mother
● Household
· direct · ~0.92
Mother
Nellie Monroe
b. ~1880
Source mother
● Household
· direct · ~0.92
Mother
Nellie Monroe
b. ~1880
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Monroe
Daughter · 1940 · age 30 · b. ~1910 · Illinois
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Sibling
Joseph Monroe
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Francis Monroe
Sibling · 1940 · age 38
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Monroe
Sibling · 1940 · age 36
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 — Peoria-County, Illinois
Open full size
1940 US Federal Census — Peoria-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00917-00065)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Nellie Monroe | 60 | Head | — | Illinois |
| 42 | Francis Monroe | 38 | Daughter | Private Secretary | Illinois |
| 43 | James Monroe | 36 | Son | Inspector | Illinois |
| 44 | Mary Monroe THIS PERSON | 30 | Daughter | Secretary | Illinois |
| 45 | Joseph Monroe | 26 | Son | Clerk | Illinois |
| 46 | Alice Grimm | 35 | Lodger | Waitress | Illinois |
| 47 | Glen Greeley | 29 | Head | Salesman | Illinois |
| 48 | Edith Greeley | 26 | Wife | Machinist | Illinois |
| 49 | Robert Greeley | 5 | Son | — | Illinois |
| 50 | Edna Allen | 49 | Lodger | — | Illinois |
| 51 | Lura Smith | 77 | Head | — | Ohio |
| 52 | Edith Smith | 40 | Daughter | Stenographer | Ohio |
| 53 | Paul Tye | 31 | Head | Millworker | Illinois |
| 54 | Catherine Tye | 30 | Daughter | — | Illinois |
| 55 | Phillipp Tye | 1 | Son | — | Illinois |
| 56 | Edward Munns | 80 | Head | Minister | England |
| 57 | Emma Munns | 80 | Wife | — | England |
| 58 | Ray Hart | 63 | Head | — | Illinois |
| 59 | Edna Hart | 55 | Wife | — | Nebraska |
| 60 | Myrtle Craig | 37 | Head | Maid | Illinois |
| 61 | Bayles Mita Craig | 22 | Lodger | Labeler | Illinois |
| 62 | Arin Duke | 72 | Lodger | — | Iowa |
| 63 | Lester Riddle | 24 | Head | Adding Machine | Illinois |
| 64 | Lara Riddle | 21 | Wife | — | Alabama |
| 65 | Lester Jr Riddle | 2 | Son | — | Illinois |
| 66 | James Riddle | 0 | Son | — | Illinois |
| 67 | Signa Alson | 26 | Head | Stenographer | Illinois |
| 68 | Maud Baldwin | 65 | Head | — | Illinois |
| 69 | Stella Baldwin | 15 | Daughter | — | Illinois |
| 70 | Earl Baker | 20 | Head | Attendant | Illinois |
| 71 | Rosena Baker | 19 | Wife | — | Illinois |
| 72 | Earl J Baker | 0 | Son | — | Illinois |
| 73 | Collins Doyle | 36 | Head | Bus Driver | Illinois |
| 74 | Dorothy Doyle | 25 | Wife | — | Illinois |
| 75 | Willis Wood | 28 | Head | Electrician | Minnesota |
| 76 | Hubert Haenig | 29 | Lodger | Electrician | Illinois |
| 77 | Harrison Edwards | 58 | Head | Laborer | Illinois |
| 78 | Ellen Edwards | 56 | Wife | — | Illinois |
| 79 | Jean Wiffle | 44 | Head | Laborer | Illinois |
| 80 | Doris Wiffle | 41 | Wife | — | Illinois |
Related Census Records
Pedigree Summary
Mary + 3 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)