Use Commas in Addresses | Varsity Tutors

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Why Do Addresses Need Commas?

Imagine you want to mail a letter to your friend. You write the name of the street, the city, and the state all in one long line. Without any commas, the mail carrier might get confused! Commas are little marks that help us separate the parts of an address so everyone knows exactly where the letter should go.

People have been writing addresses for a very long time. Let's look at how we got the system we use today.

Long, Long Ago

People delivered messages by hand. They didn't need written addresses because they knew where everyone lived in their small villages.

The 1600s

Mail services started in England and other countries. People began writing addresses on letters so carriers could find the right house.

1775

The United States Post Office was created. Benjamin Franklin was the first Postmaster General! Addresses became more important than ever.

The 1800s

Cities grew bigger. Streets got names and houses got numbers. Commas helped people keep all the parts of an address clear and organized.

Today

We use commas in addresses every day — on letters, on envelopes, and even in sentences we write for school!

So the big question is: where exactly do we put the commas? That's what this lesson is all about!

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The Rules for Commas in Addresses

An address has different parts, like puzzle pieces. Each piece tells the mail carrier something new. We use commas to separate those pieces so they don't run together. Here are the most important rules to remember.

Street & City

Put a comma between the street address and the city name. This tells the reader, "The street part is done. Now here comes the city!"

City & State

Put a comma between the city name and the state name. This separates two place names so they don't look like one word.

In a Sentence

When you write an address inside a sentence, put a comma after the state too — unless the state ends the sentence with a period.

No Comma Before the Zip Code

We do NOT put a comma between the state and the zip code. The zip code goes right after the state with just a space.

✦ Key Takeaway

Think of commas like the lines between rooms in a house. The street is one room, the city is another room, and the state is another room. Commas are the walls between them. Without walls, all the rooms would blend together and you wouldn't know where one ends and the next begins!

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See It: Commas in an Address

Let's look at a picture that shows exactly where commas go. Each part of the address is a different color so you can see how the commas separate them.

Look at the red commas in the picture. One goes between the street address and the city. The other goes between the city and the state. Notice there is no comma between the state and the zip code. Just a space!

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How It Works: Step by Step

Let's break it down into easy steps. Every time you write an address, you can follow this pattern.

ADDRESS PATTERN

Street, City, State Zip Code

Comma after street · Comma after city · Space (no comma) before zip code

When you put an address inside a sentence, the pattern changes just a little. You add one more comma after the state if the sentence keeps going.

ADDRESS INSIDE A SENTENCE

I live at Street, City, State, and I love it.

Notice the extra comma after the state — the sentence keeps going!

Here is a real example. Say you want to write about where the White House is. You would write:

The White House is at 1600 Pennsylvania Avenue, Washington, D.C., and it is very famous.

See those three commas? The first one comes after the street. The second comes after the city. The third comes after the state because the sentence keeps going. If the sentence ended right after the state, you would just use a period instead.

This flowchart shows the steps in order. First you write the street, then add a comma. Next you write the city, then add another comma. Then you write the state and zip code with just a space between them. If your sentence keeps going after the state, you add one more comma!

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Different Ways You Might See Addresses

Addresses can show up in different places. Sometimes you write them on an envelope. Sometimes you write them inside a sentence. The commas go in the same spots, but the way the address looks can change a little. Let's see some examples.

Where You See It	How It Looks	Commas Used
On an envelope	25 Oak Street Dallas, TX 75201	One comma: between city and state
All on one line	`25 Oak Street, Dallas, TX 75201`	Two commas: after street, after city
In a sentence (middle)	`She lives at 25 Oak Street, Dallas, TX, and loves it.`	Three commas: after street, after city, after state
In a sentence (end)	`She lives at 25 Oak Street, Dallas, TX.`	Two commas: after street, after city (period ends it)
City and state only	`I was born in Dallas, TX.`	One comma: between city and state

Notice something cool? On an envelope, the street goes on one line and the city, state, and zip go on the next line. Because they are on different lines, you don't need a comma between the street and the city. But when everything is on one line or in a sentence, you need that extra comma after the street.

✦ Key Takeaway

Think of commas as breathing points. When you read an address out loud, you naturally pause between the street, the city, and the state. Those pauses are where the commas go! Try reading "25 Oak Street Dallas TX" out loud — it sounds rushed. Now try "25 Oak Street, Dallas, TX" — much better!

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Worked Example

Let's practice with a complete example. A friend asks you to write her address in a sentence. Her address is 100 Maple Drive in Austin, Texas, and the zip code is 78701. Here is how to do it step by step.

Writing an Address in a Sentence

Step 1 — Write the sentence startBegin with the words before the address: My friend lives at

Step 2 — Add the street addressWrite the house number and street name: My friend lives at 100 Maple Drive

Step 3 — Add a comma, then the cityPut a comma right after the street. Then write the city name: My friend lives at 100 Maple Drive, Austin

Step 4 — Add a comma, then the statePut another comma right after the city. Then write the state: My friend lives at 100 Maple Drive, Austin, Texas

Step 5 — End the sentenceSince the sentence ends right here, we add a period. No more commas needed!

My friend lives at 100 Maple Drive, Austin, Texas. — We used two commas: one after the street and one after the city. The period at the end takes the place of the comma after the state.

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Common Mistakes to Watch Out For

Even grown-ups sometimes make mistakes with commas in addresses. Here are the most common ones so you can avoid them!

Mistake	Wrong Way ✗	Right Way ✓
Forgetting the comma between city and state	Dallas TX	Dallas, TX
Putting a comma before the zip code	TX, 75201	TX 75201
Forgetting the comma after the state in a sentence	She moved to Dallas, TX and was happy.	She moved to Dallas, TX, and was happy.
Forgetting the comma between street and city (on one line)	25 Oak Street Dallas, TX	25 Oak Street, Dallas, TX

✦ Key Takeaway

The trickiest part is knowing that commas go between the parts of an address but never before the zip code. A good way to remember: the zip code is like the state's best friend — they stick together with no comma between them!

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What Comes Next?

You are learning commas in addresses right now. But commas can do so many things! As you get older, you will learn more and more comma rules. Here is a peek at what's ahead.

What You're Learning Now	What You'll Learn Later
Commas between parts of an address	Commas between parts of a date (July 4, 2024)
Comma after the city name	Commas in a list (apples, bananas, and grapes)
Comma after the state in a sentence	Commas after introductory words (Well, I think so.)
Knowing where NOT to put a comma (before zip codes)	Using commas to combine two sentences with "and" or "but"

Every new comma rule you learn is like adding a new tool to your writing toolbox. The address comma rule is one of the first tools you're putting in that box. Great job getting started!

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Practice Problems

Now it's your turn! Try these five problems. Click "Show Answer" when you are ready to check your work.

PROBLEM 1 — WHAT DO YOU KNOW?

Why do we use commas in addresses? Tell the reason in your own words.

PROBLEM 2 — ADD THE COMMAS

Rewrite this address with the correct commas: 500 Main Street Chicago IL 60601

PROBLEM 3 — FIX THE SENTENCE

This sentence has a comma mistake. Can you find it and fix it? My grandma lives at 88 Sunset Road, Miami FL.

PROBLEM 4 — WRITE YOUR OWN

Write a sentence that uses this address: 200 River Lane, Portland, OR 97201. Your sentence should say that your cousin lives there. Remember to use all the commas you need!

PROBLEM 5 — THINK ABOUT IT

Look at this address on an envelope:

Sara Johnson
350 Pine Avenue
Denver, CO 80202

Why is there only ONE comma here instead of two? (Hint: Think about how the address is arranged on the envelope.)

SUMMARY

What You Learned

In this lesson, you learned how to use commas in addresses. An address has different parts: the street address, the city, the state, and the zip code. When you write an address all on one line or inside a sentence, you put a comma between the street and the city and a comma between the city and the state. You never put a comma between the state and the zip code.

When an address appears in the middle of a sentence, you also need a comma after the state so the reader knows the address part is done and the rest of the sentence is starting. On an envelope, the street goes on one line and the city, state, and zip go on the next line, so you only need one comma — between the city and the state. Keep practicing, and soon adding commas to addresses will feel as easy as writing your own name!