{
 "meta": {
  "title": "New Jersey Pre-1978 Housing by County (VGJ Floors service area)",
  "description": "Housing units and housing-unit-weighted share of pre-1978 and pre-1940 stock, aggregated by county across the 185 municipalities served by VGJ Floors.",
  "source": "US Census Bureau, American Community Survey 2023 5-Year Estimates, tables B01003, B25001, B25034, B25035",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "records": 9,
  "method_notes": [
   "pct_pre_1978 is an ESTIMATE. The Census reports a 1970-1979 bracket rather than a 1978 cut; 80% of that bracket (8 of 10 years) is attributed to the pre-1978 period and added to the older brackets.",
   "pct_pre_1940 is exact: the B25034 bracket is '1939 or earlier'.",
   "median_home_year is bottom-coded by the Census at 1938, meaning '1938 or earlier'. Rows where this applies are flagged in median_year_is_bottom_coded.",
   "era_tier, lead_risk and market_tier are deterministic classifications derived from the Census values, not separate measurements.",
   "County percentages are weighted by housing units, not averaged across municipalities, so a town of 200 homes does not carry the same weight as a city of 130,000.",
   "Counts cover only the municipalities in the VGJ Floors service area, not the entire county."
  ]
 },
 "data": [
  {
   "county": "Hudson County",
   "municipalities_served": 12,
   "housing_units": 317032,
   "pct_pre_1978_weighted": 61.8,
   "pct_pre_1940_weighted": 29.8,
   "median_home_year_min": 1949,
   "median_home_year_median": 1963,
   "median_home_year_max": 1984
  },
  {
   "county": "Middlesex County",
   "municipalities_served": 25,
   "housing_units": 316633,
   "pct_pre_1978_weighted": 55.8,
   "pct_pre_1940_weighted": 10.6,
   "median_home_year_min": 1952,
   "median_home_year_median": 1967,
   "median_home_year_max": 1994
  },
  {
   "county": "Essex County",
   "municipalities_served": 14,
   "housing_units": 309300,
   "pct_pre_1978_weighted": 72.9,
   "pct_pre_1940_weighted": 29.6,
   "median_home_year_min": 1938,
   "median_home_year_median": 1956,
   "median_home_year_max": 1966
  },
  {
   "county": "Ocean County",
   "municipalities_served": 32,
   "housing_units": 290941,
   "pct_pre_1978_weighted": 45.0,
   "pct_pre_1940_weighted": 4.2,
   "median_home_year_min": 1954,
   "median_home_year_median": 1976,
   "median_home_year_max": 1996
  },
  {
   "county": "Monmouth County",
   "municipalities_served": 54,
   "housing_units": 274165,
   "pct_pre_1978_weighted": 54.8,
   "pct_pre_1940_weighted": 13.8,
   "median_home_year_min": 1938,
   "median_home_year_median": 1964,
   "median_home_year_max": 2000
  },
  {
   "county": "Union County",
   "municipalities_served": 20,
   "housing_units": 210500,
   "pct_pre_1978_weighted": 77.9,
   "pct_pre_1940_weighted": 24.2,
   "median_home_year_min": 1950,
   "median_home_year_median": 1955,
   "median_home_year_max": 1965
  },
  {
   "county": "Mercer County",
   "municipalities_served": 10,
   "housing_units": 142828,
   "pct_pre_1978_weighted": 63.7,
   "pct_pre_1940_weighted": 19.1,
   "median_home_year_min": 1938,
   "median_home_year_median": 1965,
   "median_home_year_max": 1992
  },
  {
   "county": "Somerset County",
   "municipalities_served": 12,
   "housing_units": 110807,
   "pct_pre_1978_weighted": 41.9,
   "pct_pre_1940_weighted": 7.9,
   "median_home_year_min": 1955,
   "median_home_year_median": 1985,
   "median_home_year_max": 1993
  },
  {
   "county": "Burlington County",
   "municipalities_served": 6,
   "housing_units": 29781,
   "pct_pre_1978_weighted": 47.5,
   "pct_pre_1940_weighted": 8.5,
   "median_home_year_min": 1972,
   "median_home_year_median": 1994,
   "median_home_year_max": 2004
  }
 ]
}