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Mary Monahan — 1920 US Census Record
Linked across censuses1920 United States Federal Census · Frederick, Maryland
Our Model Tree links this Mary Monahan across the 1920, 1930 and 1940 US Censuses in Frederick, Maryland (XGBoost, ~Confirmed) — first a spouse (b.~1877), then head of a 4-person household.
Age 43
b. ~1877
Female
Spouse
Born: Indiana
Married
1920 Census Record Details
| Census Year | 1920 |
| Location | Frederick, Maryland |
| Surname | Monahan |
| Given Name | Mary E |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 43 |
| Marital Status | Married |
| Birthplace | Indiana |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Indiana |
| Additional Details | |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Township / Ward | Hauvers District |
| Est. Birth Year | ~1877 |
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 1920 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Charles Monahan | Head | — | 50 | ~1870 |
| Ruth Monahan | Daughter | — | 19 | ~1901 |
| William Monahan | Son | — | 14 | ~1906 |
| Mary Monahan | Spouse | — | 43 | ~1877 |
Census Appearances
1920
Frederick, Maryland
Spouse, age 43
Frederick, Maryland · implied b. ~1877 — 4 household members
| Surname | Monahan |
| Given Name | Mary E |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 43 |
| Marital Status | Married |
| Birthplace | Indiana |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Indiana |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1930
Frederick, Maryland
Head, age 54
Frederick, Maryland · implied b. ~1876 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Manahan |
| Given Name | Mary E |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 54 |
| Marital Status | Widowed |
| Birthplace | Indiana |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Indiana |
| Occupation | Farming |
| Industry | Truck Farm |
| Class of Worker | OA |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1940
Frederick-County, Maryland
Head, age 64
Frederick-County, Maryland · implied b. ~1876
●
Primary link
· ~Confirmed · 1 source
XGBoost
| Surname | Manahan |
| Given Name | Mary E. |
| Relationship to Head | head |
| Sex | F |
| Color / Race | White |
| Age | 64 |
| Marital Status | Widowed |
| Birthplace | Indiana |
| 1935 Residence (City) | Sabillasville |
| 1935 Residence (County) | Frederick |
| Class of Worker | 480 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
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 Monahan across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Monahan
Spouse · 1920 · age 43 · b. ~1877 · Maryland
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1920 US Federal Census — Frederick, Maryland
Open full size
1920 US Federal Census — Frederick, Maryland
Page Contents
50 people indexed on this census page (ia:1920:14thcensusofpopu673unit:0085)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Charles F Monahan | 50 | Head | Farmer | Maryland |
| 52 | Mary E Monahan THIS PERSON | 43 | Wife | — | Indiana |
| 53 | Ruth J Monahan | 19 | Daughter | — | Maryland |
| 54 | William J Monahan | 14 | Son | — | Maryland |
| 55 | William T Purely | 67 | Head | Farmer | Maryland |
| 56 | Alice J Purely | 65 | Wife | — | Maryland |
| 57 | Mary J Purely | 14 | Grand Daughter | — | Maryland |
| 58 | Thos W Monahan | 53 | Head | Farmer | Maryland |
| 59 | Virginia Monahan | 52 | Wife | — | Maryland |
| 60 | Emma V Monahan | 28 | Daughter | — | Maryland |
| 61 | Bessie R Monahan | 24 | Daughter | Laborer | Maryland |
| 62 | Florence E Monahan | 19 | Daughter | — | Maryland |
| 63 | Evelyn Monahan | 16 | Daughter | — | Maryland |
| 64 | John R Mccusker | 46 | Head | Farmer | Maryland |
| 65 | Annie B Mccusker | 47 | Wife | — | Maryland |
| 66 | Ruth E Mccusker | 21 | Daughter | Liner | Maryland |
| 67 | Beulah V Mccusker | 17 | Daughter | — | Maryland |
| 68 | Agnes M Mccusker | 17 | Daughter | — | Maryland |
| 69 | William J Mccusker | 15 | Son | — | Maryland |
| 70 | Marie L Mccusker | 13 | Daughter | — | Maryland |
| 71 | Agnes M Mccusker | 9 | Daughter | — | Maryland |
| 72 | Lillian J Mccusker | 7 | Daughter | — | Maryland |
| 73 | Evelyn L Mccusker | 6 | Daughter | — | Maryland |
| 74 | Arthur J Mccusker | 4 | Son | — | Maryland |
| 75 | Edith L Mccusker | 2 | Daughter | — | Maryland |
| 76 | Samuel Mowen | 31 | Head | Fireman | Maryland |
| 77 | Alice B Mowen | 33 | Sister | Ironer | Maryland |
| 78 | Lula J Mowen | 12 | Daughter | — | Maryland |
| 79 | Ida Mowen | 11 | Daughter | — | Maryland |
| 80 | Edith Irene Mowen | 9 | Daughter | — | Maryland |
| 81 | Edna Mowen | 6 | Daughter | — | Maryland |
| 82 | Ben F Mowen | 4 | Son | — | Maryland |
| 83 | George Pryor | 34 | Head | Laborer | Maryland |
| 84 | Irene M Pryor | 24 | Wife | — | Maryland |
| 85 | Margaret S Pryor | 1 | Daughter | — | Maryland |
| 86 | Lula Marie Pryor | 23 | Boarder | — | Maryland |
| 87 | Virginia Pryor | 57 | Head | — | Maryland |
| 88 | Sylas F Willard | 57 | Head | Farmer | Maryland |
| 89 | Emma J Willard | 56 | Wife | — | Maryland |
| 90 | Merle L Willard | 23 | Son | Laborer | Maryland |
| 91 | Kenneth S Willard | 10 | Son | Laborer | Maryland |
| 92 | Isaac M Brown | 35 | Head | Farmer | Maryland |
| 93 | Ada M Brown | 32 | Wife | — | Maryland |
| 94 | Clarence L Brown | 17 | Son | Laborer | Maryland |
| 95 | Jesse R Brown | 15 | Son | Laborer | Maryland |
| 96 | Amanda E Brown | 14 | Daughter | — | Maryland |
| 97 | John W Brown | 12 | Son | — | Maryland |
| 98 | William Brown | 10 | Son | — | Maryland |
| 99 | Upton L Brown | 8 | Son | — | Maryland |
| 100 | Paul M Brown | 6 | Son | — | Maryland |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1920 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)