The HOLC, or Home Owners’ Loan Corporation, was a federal agency created in 1933 to rescue American homeowners from foreclosure during the Great Depression. Over three years, it refinanced the mortgages of more than one million families with long-term loans at lower interest rates, totaling nearly $3.5 billion. But the HOLC is remembered today less for the relief it provided and more for something else it produced: color-coded maps that graded American neighborhoods on a scale from “Best” to “Hazardous,” with race as a key factor. Those maps became the foundation of what we now call redlining.
Why the HOLC Was Created
By 1933, the U.S. housing market had collapsed. Banks were failing, and homeowners who fell behind on mortgage payments had no way to refinance. Foreclosures surged. The HOLC was established as part of Franklin Roosevelt’s New Deal to stop the bleeding. It bought distressed mortgages from lenders and replaced them with new, government-backed loans that gave families longer repayment periods and lower interest rates. This kept families in their homes and injected cash into banks that were on the verge of collapse.
The scale was enormous. In a statement on the program’s record, President Truman noted the HOLC had refunded overdue mortgages for more than one million families, with total loans and later advances reaching nearly $3.5 billion. For context, that’s roughly $80 billion in today’s dollars. The program was a lifeline for a generation of American homeowners, and it’s widely credited with stabilizing the housing market during the worst economic crisis in the country’s history.
The Neighborhood Grading System
To assess lending risk, the HOLC sent field agents into cities across the country to evaluate neighborhoods. They created what became known as “Residential Security Maps,” grading each area on a four-tier scale:
- Grade A (“Best”): The most desirable neighborhoods, shaded green on the maps.
- Grade B (“Still Desirable”): Solid areas that were considered stable, shaded blue.
- Grade C (“Declining”): Neighborhoods seen as at risk of losing value, shaded yellow.
- Grade D (“Hazardous”): Areas considered the riskiest for mortgage lending, shaded red.
The agents gathered information on housing quality, recent sale and rental prices, and the trajectory of property values. But the grading didn’t stop at the physical condition of buildings or the economics of local real estate. Crucially, the racial and ethnic identity of residents was treated as a core factor in determining a neighborhood’s grade.
How Race Shaped the Maps
The HOLC’s agents and the real estate professionals they worked with operated on a shared assumption: that the presence of Black, immigrant, or certain ethnic residents lowered property values and made mortgages riskier. This wasn’t a subtle undercurrent. It was stated explicitly, repeatedly, in the written descriptions that accompanied each neighborhood’s grade.
In Sacramento, a neighborhood where “Italians predominate but with a sprinkling of Mexicans, Negroes, and Orientals” was given a red grade because “the subversive character of the population constitutes the area’s principal hazard.” In a south Philadelphia neighborhood, “infiltration of Jewish into area have depressed values.” Assessors in Minneapolis blamed the decline of “a once very substantial and desirable area” on “the gradual infiltration of negroes and Asiatics.” In Berkeley, California, an area near UC Berkeley was downgraded specifically because of “infiltration of Orientals and gradual infiltration of Negroes from south to north.”
This language appeared across dozens of cities. The presence of Black residents lowered grades in Birmingham, Oakland, Youngstown, Indianapolis, Cleveland, Los Angeles, and Chicago. Jewish families triggered downgrades in Los Angeles, Binghamton, Kansas City, and Chicago. Italian families did the same in Akron, Cleveland, and Kansas City. Polish, Hungarian, Czech, Greek, Mexican, Russian, Slavic, and Syrian families were all cataloged in similar fashion, always pulling a neighborhood’s grade downward.
These appraisers were following the conventions of their industry. Frederick Babcock, one of the most influential figures in early twentieth-century real estate appraisal, wrote in his widely used manual that “the infiltration of inharmonious racial groups” tends “to lower the levels of land values and to lessen the desirability of residential areas.” The HOLC maps translated that ideology into official government policy.
What Redlining Actually Meant
The term “redlining” comes directly from the red shading on the HOLC maps. A neighborhood with a D grade was outlined in red, signaling to lenders that it was too risky for investment. In practice, this meant families living in those areas had a much harder time getting mortgages, home improvement loans, or insurance. Without access to credit, homeowners couldn’t maintain or upgrade their properties, businesses couldn’t get financing, and neighborhoods fell into a cycle of disinvestment that reinforced the original low grade.
The effects compounded over decades. Families in green-graded neighborhoods built equity, passed wealth to their children, and lived in areas that attracted public and private investment. Families in red-graded neighborhoods were locked out of the primary wealth-building tool available to middle-class Americans: homeownership with affordable financing. Because the grading system was so deeply tied to race, the result was a systematic transfer of opportunity from communities of color to white communities.
Lasting Effects on Modern Neighborhoods
Nearly a century later, the boundaries drawn on HOLC maps still correlate with measurable differences in the neighborhoods they graded. Researchers have found that areas historically graded as “Declining” or “Hazardous” tend to have higher summer surface temperatures than areas graded “Still Desirable” or “Best.” This isn’t a coincidence. Decades of disinvestment meant fewer trees, less green space, and more concrete and asphalt in redlined neighborhoods, all of which absorb and radiate heat.
Those temperature differences have real health consequences. A study of 11 Texas cities found a significant link between a greater percentage of historically redlined areas, elevated heat exposure, and higher rates of heat-related emergency room visits and hospital admissions. The pattern extends beyond heat. Formerly redlined neighborhoods today tend to have higher rates of asthma, heart disease, and other chronic conditions, driven in part by environmental exposures that trace back to decades of underinvestment.
The HOLC’s Complicated Legacy
The HOLC occupies an unusual place in American history. It genuinely helped more than a million families keep their homes during the worst economic crisis of the twentieth century, and it demonstrated that the federal government could stabilize a collapsing housing market. The program eventually wound down, and the loans were largely repaid.
But the mapping system it created gave the weight of federal authority to racial discrimination in housing. Even after the HOLC itself dissolved, its maps and grading philosophy influenced the Federal Housing Administration and private lenders for decades. The Fair Housing Act of 1968 formally outlawed redlining, but the economic damage, concentrated poverty, environmental inequality, and racial wealth gaps shaped by those maps persists in American cities today. When researchers want to understand why certain neighborhoods look the way they do, the HOLC maps from the 1930s remain one of the most revealing documents they can study.