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Type and Size of Smallest Area Containing a Block
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2005 American Community Survey
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2000 Long-Form- Sample Census Day Sampling Rate
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Annual Initial Sampling Rate
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Cumulative 5-Year Initial Sampling Rate
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Governmental unit (county, place, township in 12 states, school district, American Indian or Alaska Native area)
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With < 200 occupied housing units (fewer than about 500 people)
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10.0% (1 in 10)
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50.0% (1 in 2)
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50.0% (1 in 2)
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With 200–800 occupied housing units (about 500-2,000 people)
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6.9% ( 1 in 14)
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34.5% (1 in 3)
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50.0% (1 in 2)
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With 800–1,200 occupied housing units (about 2,000-3,000 people)
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3.5% (1 in 28)
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17.5% (1 in 6)
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25.0% (1 in 4)
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Census tract with > 2,000 occupied housing units (more than about 5,000 people)a
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1.7% (1 in 59) or 1.6% (1 in 63)
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8.5% (1 in 12) or 8.0% (1 in 13)
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12.5% (1 in 8)
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Other areaa
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2.3% (1 in 44) or 2.1% (1 in 48)
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11.5% (1 in 9) or 10.5% (1 in 10)
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16.7% (1 in 6)
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Overal l
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2.3% (1 in 44)
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11.5% (1 in 9)
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16.7% (1 in 6)
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NOTES: Number of occupied housing units is estimated from the MAF. Because the initial ACS sample size will be kept at approximately 3 million residential addresses per year, the initial sampling rates shown will be slightly reduced as the number of occupied housing units grows. Townships and other minor civil divisions are recognized for sampling purposes in 12 states where they are functioning governments: Conne cticut, Maine, Massachusetts, Michigan, Minnesota, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, Vermont, and Wisconsin.
aThe smaller of the two ACS sampling rates shown applies for blocks in census tracts with predicted mail/CATI response rates gre ater than 60% (see Table 2-3b).
SOURCE: Adapted from U.S. Census Bureau (2006:Tables 4.1, 4.2) for the ACS.
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