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How data gets rewritten Published figures are not final. Each time this site refreshes a source it keeps the old value of every figure that changed. Each circle is one refresh rewriting one measure: the bigger, the more figures it changed. On Oct 19 alone Zillow rewrote 295,424 past home values across 955 places, by a median of 1.3%.
Circle size: figures changed
Sep 20 Sep 26 Oct 1 Oct 4 Oct 6 Oct 8 Oct 19 Oct 23 Home value index, houses and condos Observed rent index, all homes Home value to household income Annual rent to household income Home value to area median income 30-year fixed mortgage rate (filling in) Renters paying over 30% of income on hous… Median gross rent Median household income Median owner-occupied home value Affordable units in projects … (filling in) Commutes of an hour or more Median loan costs, home purchases Median borrower income, home purchases Median mortgage rate, home purchases Median mortgage, home purchases Median loan-to-value, home purchases Home heating-oil tank cleanups (filling in) Contaminated sites, cleanup o… (filling in) Contaminated sites, cleaned u… (filling in) Home value to area median inc… (filling in) Sep 20, Home value index, houses and condos: 294,469 figures in 955 places, median change 1.1% Sep 20, Observed rent index, all homes: 16,131 figures in 432 places, median change 1.4% Sep 20, Home value to household income: 2,435 figures in 409 places, median change 1.1% Sep 20, Annual rent to household income: 396 figures in 98 places, median change 1.2% Sep 20, Home value to area median income: 105 figures in 21 places, median change 1.0% Sep 26, 30-year fixed mortgage rate: 1 figures in 1 places, median change 0.7% Sep 26, Renters paying over 30% of income on housing: 3,084 figures in 567 places, median change 6.4%. This site changed how it computes this figure: renters whose housing cost burden the Census could not compute — no or negative income, or no cash rent — no longer count in the denominator, the way HUD's CHAS tables count them. The Census's figures did not change. Oct 1, Median gross rent: 53 figures in 26 places, median change —. This site stopped showing a median that falls in the Census's open-ended top or bottom bracket: the Census prints the bracket's bound there, such as $250,001 for an income of $250,000 or more, and the bound is not a median. The Census's figures did not change. Oct 1, Median household income: 30 figures in 14 places, median change —. This site stopped showing a median that falls in the Census's open-ended top or bottom bracket: the Census prints the bracket's bound there, such as $250,001 for an income of $250,000 or more, and the bound is not a median. The Census's figures did not change. Oct 1, Median owner-occupied home value: 26 figures in 7 places, median change —. This site stopped showing a median that falls in the Census's open-ended top or bottom bracket: the Census prints the bracket's bound there, such as $250,001 for an income of $250,000 or more, and the bound is not a median. The Census's figures did not change. Oct 4, Affordable units in projects reported completed: 3 figures in 3 places, median change 0.3% Oct 6, Commutes of an hour or more: 6,282 figures in 1,154 places, median change 203.6%. This site corrected how it computes this figure: it counted only commutes of 90 minutes or more, and now counts every commute of an hour or more, adding the Census's 60-to-89-minute bracket. The Census's figures did not change. Oct 8, Median loan costs, home purchases: 36 figures in 28 places, median change 1.4%. This site made how it computes this median exact: where the loans divided evenly at the middle, the figure could fall on either of two values depending on the order the records were read in, and now always falls on the same one. The lenders' records did not change. Oct 8, Median borrower income, home purchases: 9 figures in 8 places, median change 1.9%. This site made how it computes this median exact: where the loans divided evenly at the middle, the figure could fall on either of two values depending on the order the records were read in, and now always falls on the same one. The lenders' records did not change. Oct 8, Median mortgage rate, home purchases: 9 figures in 9 places, median change 1.8%. This site made how it computes this median exact: where the loans divided evenly at the middle, the figure could fall on either of two values depending on the order the records were read in, and now always falls on the same one. The lenders' records did not change. Oct 8, Median mortgage, home purchases: 6 figures in 6 places, median change 2.3%. This site made how it computes this median exact: where the loans divided evenly at the middle, the figure could fall on either of two values depending on the order the records were read in, and now always falls on the same one. The lenders' records did not change. Oct 8, Median loan-to-value, home purchases: 5 figures in 4 places, median change 0.4%. This site made how it computes this median exact: where the loans divided evenly at the middle, the figure could fall on either of two values depending on the order the records were read in, and now always falls on the same one. The lenders' records did not change. Oct 19, Home value index, houses and condos: 295,424 figures in 955 places, median change 1.3% Oct 19, Observed rent index, all homes: 16,441 figures in 424 places, median change 1.9% Oct 19, Home heating-oil tank cleanups: 162 figures in 162 places, median change 50.0% Oct 19, Contaminated sites, cleanup open: 108 figures in 108 places, median change 4.5% Oct 19, Contaminated sites, cleaned up with controls: 34 figures in 34 places, median change 4.0% Oct 19, Home value to household income: 5,109 figures in 954 places, median change 1.3% Oct 19, Annual rent to household income: 746 figures in 211 places, median change 1.8% Oct 19, Home value to area median income: 126 figures in 21 places, median change 1.2% Oct 19, Home value to area median income: 21 figures in 21 places, median change 1.1% Oct 23, 30-year fixed mortgage rate: 1 figures in 1 places, median change 0.1% Zillow’s largest rewrites, Oct 19 Place Period Was Now Change 08353 2024-06 and 90 more $309,068 $285,969 -7.5% Shiloh Cumberland 2019-05 and 90 more $203,712 $188,541 -7.4% Old Tappan Bergen 2020-11 and 317 more $842,017 $895,577 6.4%
Zillow’s home value index is smoothed and seasonally adjusted, so each new month’s sales nudge the months before it. In 2 refreshes Zillow revised 589,893 figures in all.
Kept since Sep 20, 8 refreshes in all. Rows marked “filling in” are periods that had not ended when they changed, such as a month in progress, which is expected; the others are a source correcting a period already closed. Each place’s page lists its own revised figures. Source freshness shows when each source last changed. More visual stories →