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Why Detroit and Philadelphia pay far more than their states
Insurers price by where a car is garaged. How territory rating works in Michigan and Pennsylvania, what the claims data show, and how California limits it.
Two drivers with the same record, car and coverage can pay very different prices in one state because insurers file territory rates that charge each area for the claims its drivers generate. Inside a big city those claims are more frequent, thefts and injury claims are higher, and each state's legal rules decide how expensive the injury claims are. Philadelphia is a clear example: according to the Pennsylvania Insurance Department data analyzed by the Philadelphia Inquirer, city drivers paid an average of $1,948 in 2023, 71% above the statewide $1,138.
Detroit is the better-known case, but the verified public numbers are thinner. The regulator-grade data we could open show where the pressure comes from; the quote-site comparisons that circulate are estimates, and we label them as such. This article takes the two cities side by side, adds a short look at Los Angeles to show how another state limits the practice, and ends with what a driver can check and what moving a few miles can and cannot change.
What the gap looks like
Philadelphia. The Inquirer's May 2025 analysis of data that insurers report to the Pennsylvania Insurance Department found a 2023 average of $1,948 for city drivers, 71% above the statewide average of $1,138 and 62% above the cheapest part of the region, the northern halves of Bucks and Montgomery counties. From 2014 to 2023, while consumer prices rose 31%, the city's average premium rose 70%, against 33% to 38% in the suburban zones (Philadelphia Inquirer, May 12, 2025). The department told the reporters it could not offer a single explanation.
Detroit. We found no Detroit-versus-Michigan premium table from the state regulator. Bridge Michigan reported in December 2025 that Detroit drivers still pay the highest average premiums and cited one comparison-site estimate, from CarInsurance.com, putting Detroit as much as $1,500 a year above neighboring Dearborn and $2,480 above Warren (Bridge Michigan). That is a quote-based estimate for a model driver, not a measured average of what customers pay, so use it for direction, not for a dollar figure. The same article reports a state-commissioned actuarial study estimating that the 2019 reform saved the average Michigan driver $357 a year compared with what would have happened without it.
Both gaps show up at a fine scale. The Inquirer found rates differing between zones within the Philadelphia region, and Bridge's example compares adjoining municipalities. The unit of pricing is a small territory, not a city's name.
How territory rating works
An insurer divides a state into territories, estimates each territory's claim costs from its own experience and industry data, and applies a multiplier (a relativity) to the base rate. the insurer files its territory definitions and relativities with the regulator as part of its rate filing; Michigan's regulator says so explicitly. Our guide to how car insurance rates are calculated shows where territory sits among the other multipliers, and Why your ZIP code changes your car insurance price covers the ZIP code version.
Where the lines fall is usually set by an insurer's own analysis of claims, so two companies can draw them differently. A neighborhood that is in a high-cost territory at one company can be in a middle territory at another, which is one reason quotes for the same address differ so much.
Michigan
Michigan's insurance code lists the factors insurers may use for automobile insurance and states that auto risks may be grouped by territory. The same section bars rates or classes based on sex, marital status, home ownership, educational level, occupation, credit score as the statute defines it, and the postal zone where the insured lives (MCL 500.2111). The state's insurance department (DIFS) explained in its no-fault FAQ that territories may not be based on ZIP codes or on groups of ZIP codes, that insurers may set territories by another method, and that insurers must file their territorial definitions (DIFS no-fault FAQ). Bridge Michigan notes that critics say allowing territories undercuts the ZIP-code ban. Whether or not that criticism is fair, the result is that a city-based territory is legal in Michigan, and a ZIP-based one is not.
Pennsylvania
Pennsylvania's Insurance Department says in its auto guide that the premium depends on factors that include where the vehicle is garaged, and that insurers may not charge different rates based on race, religion, national origin or gender (Pennsylvania Insurance Department auto guide). Location has limits on the eligibility side: the department said in February 2023 that Act 68 of 1998 and the Unfair Insurance Practices Act bar insurers from cancelling, declining to renew or refusing to write a motor vehicle policy based on where the vehicle is located (department notice). That protects access to coverage, not the price. A Philadelphia driver cannot be refused for living there, but can be charged the territory's rate.
What goes into a city's claims cost
Territory relativities reflect claims, so the question is why city claims cost more. The evidence we can verify points to four things.
Claim frequency
The Insurance Information Institute (III) reports that insurers say more than 55% of accidents in Philadelphia that cause some physical damage also produce a bodily injury claim, against 17% in other parts of Pennsylvania (III background on no-fault). The page does not give a year for the figure, so treat it as indicative. A higher share of crashes producing injury claims raises the cost of bodily injury and, in Pennsylvania, medical benefits coverage.
Theft
The Inquirer, citing the Pennsylvania Auto Theft Prevention Authority, reported that thefts statewide rose to about 34,000 in 2023, with about 23,000 in Philadelphia, then fell in 2024 to about 25,000 statewide and under 16,000 in the city. But it also noted that the largest gaps between city and suburban premiums opened in 2014 to 2018, before the theft surge, and that city increases in 2020 to 2023 were close to the state average. Theft explains part of the level, not the whole history.
Uninsured drivers
The Insurance Research Council estimated that 22.3% of Michigan drivers were uninsured in 2023, the fourth highest in the country, while Pennsylvania's was 11.0%, below the 15.4% national figure (III summary of the IRC study). These are statewide numbers, and we found no verified city-level estimate for Detroit or Philadelphia. The Michigan finding fits the anecdotal picture; the Pennsylvania finding does not. In Pennsylvania, where uninsured motorist coverage is optional, the cost of an uninsured driver falls mainly on the drivers who buy that coverage. In either state, our explanation of uninsured motorist coverage shows how it works.
Fraud and misreported addresses
The Bridge article mentions that Detroit residents have registered cars in cheaper cities. That practice, called rate evasion, misrepresents the garaging address, and insurers treat it as a misrepresentation on the application. It also feeds back into territory rates: the claims from cars that live in a city but are insured elsewhere are charged to the cheaper territory. Our guide on premium fraud: garaging address and driver misrepresentation covers the risk.
How state rules amplify the city effect
A city's raw claim counts are one input. State law decides what each claim costs.
Michigan's no-fault design. Michigan is a no-fault state: a driver's own personal injury protection pays medical bills regardless of fault. Until the 2019 reform, those medical benefits were unlimited for life, and as of 2024 nearly 30% of drivers had chosen a lower limit, according to the Milliman study cited by Bridge. NAIC data show the unusual shape of Michigan's liability claims: in 2022 its bodily injury frequency was 0.20 per 100 car-years with an average of $77,661, against 0.82 and $28,919 nationally, because most injury claims are paid under PIP and only the largest reach liability (NAIC Auto Insurance Database Report). The effect on a city is that a territory with more crashes pays more PIP claims, and each PIP claim could be open-ended until the reform. For details, see michigan's no-fault reform explained.
Pennsylvania's tort choice. Pennsylvania drivers choose between full tort and limited tort, which restricts recovery of pain and suffering unless the injury meets the statute's definition. The department's guide says limited tort offers significant premium savings, and the III says fewer than half of Pennsylvania policyholders have chosen it, compared with more than 85% in New Jersey. A claim system with more full-tort drivers lets more injury claims go on to lawsuits. The same Inquirer article quotes an industry lobbyist describing Philadelphia as a high-lawsuit jurisdiction; that is the industry's characterization, and we did not verify it independently.
Uninsured motorist rules. Whether UM coverage is mandatory, optional or must be offered determines who bears the uninsured driver's costs.
A short comparison: Los Angeles and California's guardrails
Los Angeles shows how a state can narrow the gap by limiting the weight of location. California's regulations require insurers to rate first on three mandatory factors in a fixed order of importance, and the rule on factor weights says the weights must line up in decreasing order: driving safety record first, then annual miles driven, then years of driving experience, then each optional factor. Location is an optional factor, defined through relative claim frequency and severity bands for the area where the car is garaged. Each of those two location factors is limited to 20 categories, and the bands group ZIP codes or census tracts with similar claim experience (10 CCR 2632.5 and 10 CCR 2632.8).
We did not verify a Los Angeles premium comparison, so there is no number here. The point is the rule: in California a territory cannot outweigh a driver's own record, while Michigan and Pennsylvania do not have an equivalent ranking requirement in the sources we opened. A driver in a high-cost city is more able to offset a bad territory with a clean record in California than elsewhere. Rules differ by state and change, so check your state regulator or the state car insurance requirements lookup tool.
A worked example: how a territory multiplier reaches your bill
Everything below is hypothetical. Say an insurer's filed base rate for one coverage package is $700 a year. Your driver factors (age, record, car, credit where allowed) multiply to 1.20. The insurer has two territories: Territory A, a suburb, with a relativity of 1.00, and Territory B, a city neighborhood, with 1.70.
- Territory A: $700 × 1.20 × 1.00 = $840 a year.
- Territory B: $700 × 1.20 × 1.70 = $1,428 a year.
The same driver, car and coverage differ by $588 because of the address. Note what a ban on ZIP-code territories would and would not change: it changes how Territory B is drawn, not whether the city's claims experience is higher. If the insurer's data show city claims cost 70% more, the multiplier will appear in some form.
What you can verify, and what moving does
- Confirm your garaging address is correct. An address one block over the boundary can put you in a different territory. Check the declarations page for the address used.
- Ask which territory you are in. The insurer must have filed territory definitions; ask your agent or the company how your address is classified. In Michigan, territories can't be built from ZIP codes.
- Compare several insurers. Territory lines and relativities are the insurer's own. The same address can price very differently across companies.
- Ask about choices your state allows. In Pennsylvania, compare limited tort and full tort. In Michigan, compare PIP medical limits.
- Check for errors and discounts. Mileage, a parked car, a defensive driving course and bundling affect price whatever the territory.
- If you really move, re-quote before the move date. A move of a few miles across a territory line can change the price in either direction. Report the new address accurately.
- Do not register a car elsewhere to avoid the city rate. It is misrepresentation.
If you believe a rate is unfair or that a state rule was broken, the state insurance department takes complaints, and a licensed attorney can advise on disputes.
Common questions
Is it legal for an insurer to charge more because of where I live?
In Michigan and Pennsylvania, territory rating is allowed within limits: Michigan bars ZIP-based territories, Pennsylvania bars refusing coverage based on location, and both bar certain personal characteristics. California allows it as a lower-weighted optional factor. Check your own state's rules.
Why did Philadelphia premiums rise faster than the suburbs?
The Pennsylvania Insurance Department told the Inquirer it could not give a single explanation. The newspaper's data show the widest divergence in 2014 to 2018, not during the 2020 to 2023 theft surge.
Will the Michigan reform bring Detroit rates down to the state average?
Not on current evidence. The Bridge article reports that Detroit drivers still pay the highest average premiums after the reform, though the state-commissioned study found statewide savings of $357 a year relative to what would have happened without it.
Does a clean record cancel out a high-cost city?
It lowers your premium within the territory but does not remove the territory multiplier, except where state rules cap the weight of location, as in California.
Key takeaways
- Insurers price by garaging territory, and a city's territory reflects its own claim frequency, theft and injury-claim costs; two nearby addresses can be in different territories.
- Philadelphia drivers paid $1,948 on average in 2023, 71% above the Pennsylvania average of $1,138, and the city's premiums rose 70% from 2014 to 2023 against 33% to 38% in the suburbs, according to the Inquirer's analysis of Insurance Department data.
- Michigan bans ZIP-based territories but allows territory rating generally; Pennsylvania bars refusing coverage based on location but not pricing by it; California ranks location below driving record, mileage and experience.
- State law amplifies the effect: Michigan's PIP design shaped its claims costs, and Pennsylvania's tort choice affects how many injury claims turn into lawsuits.
- A driver can check the garaging address, ask which territory applies, compare insurers and choose among the state's coverage options, but should never misreport an address.