Look at a map of almost any large American city and you will find lines, some drawn on paper in the 1930s and some still visible in the streets today. Those lines affected who could buy a home, who could borrow money, and who got to build wealth that could be passed down. To understand today’s neighborhoods, it helps to understand the maps.
Quick answer: Redlining was the practice of marking certain neighborhoods as high-risk for mortgage lending, often because of the race or ethnicity of residents. It is named for the red-shaded areas on 1930s federal maps, and it operated alongside federal housing policy and private lending and real estate practices. It is illegal now, but historians and economists study its lasting effects on homeownership, wealth and neighborhood conditions.
What was redlining, exactly?
Redlining was the denial or limiting of credit, insurance and investment in certain neighborhoods based on perceived risk, with that risk judged partly by the race, ethnicity and class of the people who lived there. The term comes from the red areas on lenders’ and government maps that signaled “hazardous.”
The practice was not a single act by a single villain. It was a pattern built from federal agencies, local banks, real estate boards, appraisers and insurers, each responding to its own incentives and the prejudices of its time. That is why it is best understood as a system.
Redlining is closely related to the Jim Crow era’s broader web of segregation. If you want that background, see our explainer on what Jim Crow laws were.
Where did the idea come from?
In the early 1930s, the Great Depression pushed huge numbers of homeowners into default. Banks were failing and foreclosures were everywhere. The federal government responded by creating new housing and lending institutions to stabilize the market.
The old mortgage system had been unforgiving. Loans often required large down payments and short repayment periods, ending in a big balloon payment. New federal programs helped create the long-term, fixed-rate mortgage that many Americans now consider normal. That was a real innovation, and it opened homeownership to millions.
The question that matters for this story is who got access to it.
The HOLC maps: what they were and what they did
The Home Owners’ Loan Corporation (HOLC) was created in 1933 to refinance mortgages for struggling homeowners. In the mid-to-late 1930s, it also produced “residential security maps” for many cities, assessing the risk of lending in different neighborhoods.
The four grades
Neighborhoods were sorted into four categories, each with a color. The grading drew on information from local real estate professionals and lenders.
| Grade | Color | Label on the maps | What it generally signaled |
|---|---|---|---|
| A | Green | “Best” | New, affluent, homogeneous areas seen as safest for lending |
| B | Blue | “Still Desirable” | Stable areas expected to hold value |
| C | Yellow | “Definitely Declining” | Older areas seen as slipping, often with mixed populations |
| D | Red | “Hazardous” | Areas seen as highest risk, often where Black residents or immigrants lived |
The area descriptions that accompanied the maps often mentioned the race and ethnicity of residents directly as a factor in risk. Black neighborhoods were very commonly graded D, and so were some immigrant and working-class areas. Even well-kept Black neighborhoods were frequently rated poorly, a period when the Great Migration was reshaping American cities.
The maps did not invent prejudice, but they gave it a color, a grade and the look of neutral arithmetic.
The FHA and the wider system
The Federal Housing Administration (FHA), created in 1934, insured mortgages made by private lenders. That insurance lowered the risk for banks, which made them far more willing to lend. It was a major engine of postwar suburban growth.
But the FHA also had underwriting standards, and its manuals encouraged valuing homes partly on neighborhood stability, which included keeping neighborhoods racially similar. Historians have documented that FHA guidance and practice favored new, white suburban developments and discouraged lending in older urban areas and in integrated or Black neighborhoods. Some developers were reportedly required, or strongly encouraged, to include racial covenants to qualify for backing.
A note on what historians debate
Scholars agree that federal policy and private practice both discriminated. They debate the exact role of the HOLC maps. Some researchers argue the HOLC maps mostly reflected existing lending patterns and attitudes rather than creating them, and that the FHA’s own, separate maps and rules mattered more for the flow of credit. Others emphasize that the HOLC maps helped standardize and spread the logic of racial risk-rating. Both can be partly true.
The private side of the story
Banks, insurers, appraisers and real estate agents had their own practices. Real estate codes of ethics in that era often treated neighborhood integration as a threat to property values. Restrictive covenants, clauses in deeds that barred sales to certain groups, were common. The Supreme Court ruled in 1948 that courts could not enforce them, though they lingered in practice for years. For more on how the Court works, see our plain-English guide to the Supreme Court.
How the system worked in practice
The incentives are worth laying out, because they explain why the pattern persisted without requiring a single mastermind.
- Lenders wanted low risk. If appraisers and regulators treated Black or mixed neighborhoods as risky, lenders had reasons to avoid them.
- Avoided areas lost investment. Without loans, owners had trouble selling, buying or repairing, which lowered values and seemed to confirm the original judgment.
- Favored areas gained. Loans flowed to new suburbs, where homes appreciated and families built equity.
- Families were sorted. Many Black families who qualified for loans on paper were still steered or shut out, and some bought on exploitative installment contracts instead.
This is a feedback loop. A prediction of decline helped cause the decline it predicted. Economists sometimes call this kind of dynamic a self-fulfilling prophecy.
Redlining and the other postwar policies
Housing was not the only area where policy sorted opportunity. The postwar era also included benefits for veterans, highway construction and city redevelopment, and each interacted with the housing system.
- Veterans’ home loan benefits were available in law to all veterans, but in practice access to lenders and neighborhoods differed. See our guide to the GI Bill and Black veterans.
- Highway and renewal projects often ran through neighborhoods that had been graded low, displacing residents. See what urban renewal was.
- Earlier federal programs also had uneven reach. See what the New Deal was, and who was left out.
For the bigger picture on how these pieces fit, read How Policy Shaped Wealth in America.
Why housing matters so much for wealth
For most American families, a home is the largest asset they will ever own. Home equity can pay for college, a business, medical bills or a cushion in retirement, and it can be passed to children.
That is why differences in access to homeownership in the mid-20th century can echo for generations. A family that bought in a rising suburb in 1950 and one that was shut out started on different financial paths, even if they earned the same.
A home is not just shelter. For most families it is the main way wealth is built and handed down.
What are the lasting effects?
Researchers have studied connections between old HOLC grades and present-day conditions. Their findings are real but need careful reading.
What studies have commonly found
- Neighborhoods once graded D tend, on average, to have lower homeownership rates and lower home values than those once graded A or B.
- Some studies link formerly redlined areas to less tree cover and hotter summer temperatures, since investment in parks and trees often followed investment in housing.
- Researchers have also reported links to differences in some health outcomes and to the racial wealth gap, which remains large today. The figures vary by study and by year, so check recent data from sources like the Federal Reserve.
What is still debated
Correlation is not the same as causation. Many things happened to these neighborhoods after the 1930s, including highway building, disinvestment, deindustrialization, school funding patterns and later lending practices. Economists try to separate these effects, and they do not all agree on how much weight the maps themselves deserve.
Some people argue that today’s gaps owe more to current factors, such as family structure, education, local economies and individual choices. Others argue that past policy set the starting conditions that still shape those factors. A fair reading is that history and present conditions both matter, and the open question is how much each contributes and what, if anything, policy should do about it. That is a question of values as much as of data.
How did redlining end?
The shift came through a series of changes, not one event.
- In 1948, the Supreme Court held that courts could not enforce racially restrictive covenants.
- The Fair Housing Act of 1968 prohibited discrimination in the sale, rental and financing of housing.
- The Equal Credit Opportunity Act of 1974 barred discrimination in credit.
- The Home Mortgage Disclosure Act of 1975 required lenders to report lending data, and the Community Reinvestment Act of 1977 encouraged banks to serve the communities where they take deposits.
These laws changed the rules, but they did not erase the geography or the wealth differences already built. Enforcement has continued, and federal agencies have brought cases over modern lending discrimination. Laws and enforcement priorities change, so check current official sources such as HUD and the Consumer Financial Protection Bureau.
Is “redlining” always the right word?
People use the term in several ways. Historians use it for the specific mid-century practices described here. Today it is sometimes applied to modern lending patterns, and also loosely to any kind of neighborhood disinvestment. Because the word carries weight, it helps to ask what someone means by it and what evidence they are pointing to.
That habit of asking is part of media literacy. Our media literacy guide offers tools for spotting when a term is doing more work than the facts behind it.
Think about it: If a policy shaped who could build wealth 80 years ago, what do you think a fair response looks like today, if any? Where do you see the strongest arguments on different sides, and which parts are questions of fact versus questions of values?
Where to go from here
Redlining is one thread in a longer story about how law, markets and prejudice interacted. Understanding it does not require agreeing on what should be done now. It requires knowing what happened and holding it alongside the evidence about today.
For more context, explore American History That Explains Today or browse the full History & Context section. If these topics come up around the dinner table, our guide to talking about politics with family can help keep the conversation productive. Local zoning and housing decisions are often made by city councils, so it is worth knowing what a city council does.
Key takeaways
- Redlining was the practice of treating certain neighborhoods as high-risk for lending, often based on the race and ethnicity of residents.
- The HOLC maps of the 1930s graded neighborhoods A to D, with D shaded red, while the FHA and private lenders had their own discriminatory standards.
- The system worked through incentives and feedback loops, not a single villain, which helps explain how it lasted.
- Homeownership is a main source of family wealth, so unequal access had effects that carried across generations.
- Researchers find links between old map grades and present-day conditions, but they debate how much is cause and how much is correlation.
- Discrimination in housing and lending is illegal today, but the geography and wealth patterns it shaped persist.
Frequently asked questions
What was redlining in simple terms?
Redlining was the practice of treating certain neighborhoods as too risky for mortgage lending, often because of who lived there, especially Black residents and immigrants. The name comes from the red-shaded areas on 1930s maps that rated neighborhood credit risk. Lenders and federal agencies used similar judgments to decide where loans would flow.
Who created the redlining maps?
The Home Owners’ Loan Corporation (HOLC), a federal agency created in 1933, produced the best-known maps for many American cities in the mid-to-late 1930s. Local real estate professionals and lenders helped assess neighborhoods. Historians note that the Federal Housing Administration and private lenders also used their own underwriting standards, so HOLC was one part of a larger system.
Is redlining still legal?
No. The Fair Housing Act of 1968 banned discrimination in housing, and the Equal Credit Opportunity Act of 1974 and the Community Reinvestment Act of 1977 addressed discrimination and lending in underserved areas. Enforcement still happens, and regulators have pursued modern lending discrimination cases. Check current official sources such as HUD and the Consumer Financial Protection Bureau for today’s rules.
Did the HOLC maps cause the problems we see in those neighborhoods today?
Researchers broadly agree the maps reflected and reinforced a wider system of discrimination in lending, insurance and real estate. Scholars debate how much of today’s gaps trace to the maps themselves versus the many other policies and private practices of the era. Studies have found links between old map grades and present-day differences in things like home values and heat exposure, but correlation does not settle causation.
How is redlining different from restrictive covenants?
Redlining was about credit and investment: whether loans and insurance were available in an area. Restrictive covenants were clauses in property deeds that barred sales to certain groups. The Supreme Court ruled in 1948 that courts could not enforce them. The two worked together, since covenants kept neighborhoods separate while redlined maps shaped who could borrow.