U.S. census records provide a long statistical view of population change, the changing cost of enumeration, and the information available to genealogists. The federal decennial census counted 3,929,214 people in 1790 and 331,449,281 in 2020. Historical totals and costs below come from the Census Bureau’s Measuring America series; 2020 age and sex figures come from the Census Bureau’s Age and Sex Composition: 2020 report.
Contents
- Population counts from 1790 to 1860
- Population counts from 1870 to 2000
- The cost of early enumeration
- Enumeration costs from 1890 to 2000
- Age and sex in the 2020 Census
- What genealogists can access
Population counts from 1790 to 1860
The first eight federal decennial censuses show the United States growing from fewer than 4 million counted residents to more than 31 million. These are historical census counts for the stated census years, not current estimates or forecasts.
| Census year | Population counted |
|---|---|
| 1790 | 3,929,214 |
| 1800 | 5,308,483 |
| 1810 | 7,239,881 |
| 1820 | 9,633,822 |
| 1830 | 12,866,020 |
| 1840 | 17,069,458 |
| 1850 | 23,191,876 |
| 1860 | 31,443,321 |
The 1790 census counted 3,929,214 people, followed by 5,308,483 in 1800 and 7,239,881 in 1810. The 1820 count was 9,633,822, while the 1830 count reached 12,866,020. The 1840 census counted 17,069,458 people. Counts then rose to 23,191,876 in 1850 and 31,443,321 in 1860. These figures are reported in the Census Bureau’s Measuring America: The Decennial Censuses From 1790 to 2000.
For family-history research, the year matters as much as the total. A census-year population figure describes the complete national count for that enumeration, while an individual record may contain a household, address, names, ages, relationships, or other fields depending on the census form and surviving records. The national totals provide context for the scale of the record set; they do not identify a particular ancestor.
Population counts from 1870 to 2000
The later historical series continues at ten-year intervals through 2000. The national count passed 50 million in 1880, 100 million in 1920, and 200 million in 1970.
| Census year | Population counted |
|---|---|
| 1870 | 38,558,371 |
| 1880 | 50,155,783 |
| 1890 | 62,979,766 |
| 1900 | 76,303,387 |
| 1910 | 91,972,266 |
| 1920 | 105,710,620 |
| 1930 | 122,775,046 |
| 1940 | 131,669,275 |
| 1950 | 151,325,798 |
| 1960 | 179,323,175 |
| 1970 | 203,302,031 |
| 1980 | 226,542,199 |
| 1990 | 248,718,301 |
| 2000 | 281,421,906 |
The 1870 census counted 38,558,371 people, and the 1880 census counted 50,155,783. The 1890 count was 62,979,766; 1900 reached 76,303,387; and 1910 reached 91,972,266. The 1920 census counted 105,710,620 people, followed by 122,775,046 in 1930 and 131,669,275 in 1940.
Postwar counts were 151,325,798 in 1950 and 179,323,175 in 1960. The 1970 census counted 203,302,031 people. The series then recorded 226,542,199 in 1980, 248,718,301 in 1990, and 281,421,906 in 2000. The source reports these historical figures as published; this article does not recompute them or present derived growth rates.
The cost of early enumeration
The Census Bureau’s historical table also reports the cost of enumerating the population. These are published census costs for the stated years, not inflation-adjusted comparisons and not recalculated cost-per-person measures.
From 1790 through 1880, the reported costs were:
- 1790: $44,377
- 1800: $66,109
- 1810: $178,445
- 1820: $208,526
- 1830: $378,545
- 1840: $833,371
- 1850: $1,423,351
- 1860: $1,969,377
- 1870: $3,421,198
- 1880: $5,790,678
The 1790 census cost $44,377 to enumerate the population, while the 1800 census cost $66,109. The reported cost rose to $178,445 in 1810 and $208,526 in 1820. It was $378,545 in 1830 and $833,371 in 1840. The 1850 census cost $1,423,351, followed by $1,969,377 in 1860, $3,421,198 in 1870, and $5,790,678 in 1880. These figures are from Measuring America, which retains the historical measurement years and reports census cost as published.
Because the cost series is not adjusted here, a larger dollar figure in a later census should not be read as a direct measure of increased real cost. It reflects the published amount for that enumeration and belongs alongside the population count and year that define its scope.
Enumeration costs from 1890 to 2000
Reported enumeration costs changed substantially across the twentieth-century census series. The historical amounts were $11,547,127 for 1890 and $11,854,000 for 1900. The table then reports $1,596,800 for 1910 and $2,511,700 for 1920.
| Census year | Reported enumeration cost |
|---|---|
| 1930 | $40,156,000 |
| 1940 | $67,527,000 |
| 1950 | $91,462,000 |
| 1960 | $127,934,000 |
| 1970 | $247,653,000 |
| 1980 | $1,078,488,000 |
| 1990 | $2,492,830,000 |
| 2000 | $4,500,000,000 |
The 1930 census cost $40,156,000, and the 1940 census cost $67,527,000. The reported amount was $91,462,000 in 1950, $127,934,000 in 1960, and $247,653,000 in 1970. It reached $1,078,488,000 in 1980, $2,492,830,000 in 1990, and $4,500,000,000 in 2000. These amounts, including the earlier 1890–1920 figures, are from the Census Bureau’s Measuring America.
The apparent change between neighboring entries should be interpreted cautiously. The source presents historical census costs, but this dataset does not provide a harmonized methodology, inflation adjustment, or explanation for each year-to-year movement. For that reason, the amounts are useful as an enumeration-cost record, not as a standalone efficiency ranking.
Age and sex in the 2020 Census
The 2020 Census counted 331,449,281 people, compared with 308,745,538 in the 2010 Census. The age and sex figures below describe the 2020 Census population; the 2010 figure is supplied only for the overall comparison.
| 2020 measure | Count | Share |
|---|---|---|
| Males | 162,685,811 | 49.1% |
| Females | 168,763,470 | 50.9% |
| Under age 18 | 73,106,000 | 22.1% |
| Under age 5 | 18,400,235 | 5.6% |
| Ages 5–17 | 54,705,765 | 16.5% |
| Ages 18–44 | 118,273,566 | 35.7% |
| Ages 45–64 | 84,277,214 | 25.4% |
| Age 65 and over | 55,792,501 | 16.8% |
The 2020 Census counted 162,685,811 males, or 49.1% of the population, and 168,763,470 females, or 50.9%. It counted 73,106,000 people under age 18, including 18,400,235 children under age 5 and 54,705,765 people ages 5–17.
Among adults, 118,273,566 people were ages 18–44, representing 35.7% of the population, and 84,277,214 were ages 45–64, representing 25.4%. The census counted 55,792,501 people age 65 and over, or 16.8%. Within that older group, 33,111,965 people were ages 65–74, 16,344,101 were ages 75–84, and 6,336,435 were age 85 and over. Their reported shares were 10.0%, 4.9%, and 1.9%, respectively. The figures are from Age and Sex Composition: 2020.
For genealogy, these aggregate age groups describe the population surrounding an individual record rather than the age of a specific ancestor. Individual-record interpretation still depends on the census year, locality, household, and fields actually present in the record.
What genealogists can access
The National Archives states that federal population census records from 1790 through 1950 are digitized and available online through National Archives partners. The access statement concerns federal decennial population census records and their availability for research; it does not mean every historical record has identical fields, legibility, or indexing quality.
The current individual-record access boundary is based on a 72-year restriction. That restriction makes 1950 the most recent census year currently available for individual records in the stated 2022–2026 period. The 1950 Census records were released on April 1, 2022, 72 years after the 1950 census year. These milestones and the access explanation come from the National Archives’ About Census Records page.
Modern aggregate census statistics remain publicly available even when individual records are not yet released. This distinction matters when comparing the 2020 population, age, and sex figures with genealogy records: the 2020 totals are public statistical measurements, while the 2020 individual population schedules are not part of the currently available 1790–1950 individual-record range described by the National Archives.
When using census records in a family-history project, record the census year and geography alongside every finding. Keep historical population counts, published enumeration costs, modern aggregate measurements, and individual-record access dates as separate types of evidence. That preserves the scope of each statistic and makes it clearer which numbers describe the nation, which describe a demographic group, and which relate to an ancestor’s document.