The 1999 D Pennsylvania State Quarter is worth anywhere from its $0.25 face value in worn condition to over $100 in high-grade mint state. If you have recently emptied your pockets and found one of these coins featuring the “Commonwealth” statue, you might be surprised to learn that certain versions are highly sought after by collectors.

The Basics of the 1999 D Pennsylvania Quarter

The 1999 Pennsylvania quarter was the second coin released in the historic 50 State Quarters Program. Struck at the Denver Mint—indicated by the “D” mint mark on the obverse—this coin honors the second state to join the Union. The design on the reverse features the outline of the state, a keystone, and the statue “Commonwealth” which perches atop the Pennsylvania State Capitol dome.

If you are just starting to look at your change, using a top coin identifier app can help you distinguish between a common circulated coin and a potential treasure. Most of the coins you find at the grocery store will have significant wear and tear. Because the Denver Mint produced over 350 million of these quarters, they are extremely common in everyday pocket change.

However, “common” does not mean “worthless.” While a scratched and dull coin is likely only worth twenty-five cents, collectors are always looking for specimens that look like they just came off the press. If your coin has a sharp strike and no visible scratches, it could be a candidate for a professional grade. You can use CoinKnow to compare your coin against high-resolution images to see where yours stands.

Determining the Value of Your 1999 D Quarter

To understand the 1999-D Pennsylvania State Quarter value, you must look at the “Mint State” (MS) grade. Coins are graded on a scale from 1 to 70. Most quarters found in jars or piggy banks are “Circulated,” meaning they have lost their original luster. These are generally spent at face value.

The real excitement begins with coins graded MS65 and higher. An MS65 Pennsylvania quarter might sell for a few dollars, but as you climb to MS67 or MS68, the price jumps significantly. This is because it is very difficult to find 1999 quarters in perfect condition after twenty-five years of existence.

Condition / Grade	Estimated Market Value
Circulated (Average Wear)	$0.25
Uncirculated (MS63)	$1.00 – $3.00
Choice Mint State (MS65)	$5.00 – $12.00
Superb Gem (MS67)	$40.00 – $85.00
Perfect Grade (MS68+)	$250.00+

For those tracking the market, checking a comprehensive state quarter price guide is a great way to stay updated on what collectors are currently paying. Keep in mind that professional grading by companies like PCGS or NGC is usually required to realize these top-tier prices.

Valuable Errors to Look For in 1999 State Quarters

Errors are where the big money often hides. When millions of coins are struck, mistakes happen. For the Pennsylvania quarter, collectors keep an eye out for “Die Cracks” or “Clad Layers” that have peeled away. A common error across the 1999 series is the “Grease Strike,” where grease filled the die and caused parts of the design to appear faint or missing entirely.

One of the most valuable errors isn’t specific to the Denver mint but affects the 1999 series: coins struck on the wrong metal planchet. For example, if a Pennsylvania design was accidentally struck on an experimental “Saga” alloy planchet meant for the Sacagawea dollar, the coin could be worth thousands of dollars. You can find more detailed 1999 quarter error and value information online to help identify these rare anomalies.

If you think you see a strange mark or a double image on your coin, don’t clean it! Cleaning a coin actually reduces its value to collectors. Instead, take a high-quality photo and upload it to the CoinKnow app. The community and AI tools can often tell you if you are looking at a valuable mint error or just a scratch from a vending machine.

Why the Mint Mark Matters

The small “D” located on the right side of George Washington’s ponytail tells us this coin was made in Denver. While the Denver mint produced a high volume, early State Quarters like the 1999 Pennsylvania D often suffered from “bag marks.” These are small nicks caused when coins clank against each other in large canvas bags at the mint.

Because finding a 1999-D without these marks is statistically difficult, the value of pristine examples stays high. Collectors are trying to complete “State Quarter Sets” in the highest possible quality. If you happen to have an uncirculated roll of 1999-D Pennsylvania quarters tucked away in a drawer, it might be time to search through it.

Even if you aren’t a hardcore numismatist, checking your change can be a rewarding hobby. With the help of the CoinKnow app, you can quickly determine if that shiny quarter you just received is a standard twenty-five cent piece or a premium coin worth a trip to the local coin shop.

Frequently Asked Questions about the 1999-D Pennsylvania Quarter

Q: Is the 1999 D Pennsylvania quarter made of silver?

A: No, the standard 1999-D Pennsylvania quarters released for circulation are made of a copper-nickel clad composition. Only specific Proof sets from the San Francisco (S) mint were made in 90% silver.

Q: How can I tell if my 1999 D quarter is Uncirculated?

A: An uncirculated coin will have “mint luster,” a frosty or satiny sheen that reflects light in a fan-like pattern when rotated. If the highest points of the design (like Washington’s cheek or the statue’s chest) look flat or dull, the coin is likely circulated.

Q: Where is the mint mark on the 1999 Pennsylvania quarter?

A: The mint mark is located on the “heads” side (obverse), just to the right of George Washington’s ponytail and below the “In God We Trust” motto.

Q: Why are some 1999 quarters worth more than others?

A: Value is driven by “grade” (condition) and rarity. While there are millions of Pennsylvania quarters, there are very few in “MS68” condition or with significant mint errors, which makes those specific coins highly valuable.