GDP: BEA nominal, 2020–2024. Population & change: Census PEP Vintage 2025. Avg wage: BLS QCEW county annual pay 2023 (CBP payroll÷employment fallback). Income per capita: BEA CAINC1 2024. Location quotient: employment concentration vs. the national base — CBP 2-digit, or BLS QCEW for deep sectors (2023). Unemployment: BLS LAUS, most recent month. Business formation growth: Census BFS county applications, 2020→2024 CAGR (2022+ counts carry Census differential-privacy noise). Affordability: BEA CAINC1 per-capita income CAGR minus FHFA county HPI CAGR, 2020→2024 — positive means incomes are outpacing home prices. Interstate & port distance: county centroid to nearest BTS National Highway System segment / USACE port or dock, computed by Economic Atlas. Intl migration: net international migration per 1,000 residents — Census PEP Vintage 2025 components of change summed over the 2020→2025 window ÷ 2025 population × 1,000; a net census estimate (arrivals minus departures), not an official immigration statistic. FEMA risk: National Risk Index composite (0–100), a current point-in-time release — relative hazard exposure, not a trend. Poverty: Census ACS 5-year estimate (table B17001) — share of the population for whom poverty status is determined (excludes people in institutional group quarters, college dormitories, and military barracks) with income below the federal poverty threshold, shown with its 90% margin of error; treat differences inside the MOE as noise. Estab/10k: Census CBP establishment COUNT (physical business locations, 2023) for the selected sector, per 10,000 residents — distinct from the LQ column, which measures employment concentration, not location count. Suppressed cells show “—”, never zero.