Do You Put A Period After Street Abbreviations? | Style Fix

Street abbreviations look tiny, but they change the tone of a sentence and the look of a mailing line. “Main St” feels like label text. “Main St.” feels like edited prose. Both can be correct. The trick is picking one pattern and sticking with it.

This article shows when to use periods with street abbreviations, when to skip them, and how common style rules treat street lines, directions, and intersections. You’ll get clear patterns you can use in essays, newsletters, resumes, and mail pieces without second-guessing every “St” and “Ave.”

What A Period After A Street Abbreviation Signals

A period after an abbreviation tells the reader, “I shortened a word.” In running text, that signal can help when the shortened form is not instantly familiar. In a delivery block, the same period can add clutter and can slow machine reading.

So the real question is not “Is the period right?” It’s “Which setting am I writing for?”

Three settings That Change The Answer

• Mailing labels and envelopes: clean, standardized delivery lines matter more than prose rhythm.
• Journalism and news writing: house style often treats “St.”, “Ave.”, and “Blvd.” in a set way when a street number comes first.
• School and bookish writing: many academic styles either prefer fewer periods or use them only in a narrow set of abbreviations.

When You Should Skip Periods In Mailing Lines

If you’re writing a delivery block for mail, punctuation is often left out. The U.S. Postal Service notes that, aside from the ZIP+4 hyphen, punctuation may be omitted in the delivery block. USPS Publication 28 guidance on punctuation spells out this approach for postal formats.

That doesn’t mean a period makes a mailing block “wrong.” It means the cleanest postal format usually avoids extra marks. Many organizations go further and use standard abbreviations, no commas, and steady spacing, because it stays readable for both people and sorting systems.

How This Looks On The Page

In a delivery block, you’ll often see street types without periods:

• 123 MAIN ST
• 45 OAK AVE APT 6B
• 900 W PINE BLVD

In a sentence, you may still keep the period if your chosen style uses it:

• Send the forms to 123 Main St. by Friday.
• Her office is at 45 Oak Ave., Apartment 6B.

When Periods Make Sense In Running Text

Running text has a different job than a label. It has to read smoothly, and it has to match the style rules your reader expects. Periods can help in two spots: when the shortened form is a clipped word, and when a stylebook uses periods for certain street types as a house rule.

Use A Period When The Short Form Looks Like A Cut Word

Some abbreviations are chopped forms that still look like part of the original word. In prose, a period can mark that cut. You’ll see this with “Dept.” or “Univ.” In some house styles, “Blvd.” and “Ave.” fit this pattern too.

Skip The Period When It Reads Like A Label

If your text already reads like a label—forms, tables, maps, captions, directories—periods can feel fussy. In those cases, “Main St” and “Oak Ave” can fit better than “Main St.” and “Oak Ave.”

How Major Style Rules Treat Street Abbreviations

Stylebooks do not all treat street abbreviations the same way, so pick one that matches your setting. If you’re writing for a class, your instructor may want a school style. If you’re writing for a campus paper, the newsroom style will usually win.

AP Style With Street Numbers

AP style commonly abbreviates “Ave.”, “Blvd.”, and “St.” when they appear with a street number. Purdue OWL’s AP style overview summarizes this pattern and shows that the period stays with those abbreviations.

Two details matter here:

• When the line has a street number, AP shortens the street type and keeps the period.
• When there is no street number, AP often spells the word out as “Street,” “Avenue,” or “Boulevard.”

Postal Standards Versus Editorial Style

It’s normal to see “123 Main St.” in a news story and “123 MAIN ST” on the envelope for that same place. That difference is not sloppiness. It’s context-based formatting.

If you run a site or a school newsletter, you can set one rule for body text and another rule for delivery blocks. That keeps both pieces clean.

Common Choices And What They Say

If you’re still stuck, decide what your reader expects first. Then match the tone you want.

Clean and modern

Many modern publications drop periods in most abbreviations. In that approach, “Main St” is fine in running text, and it matches delivery blocks. The trade-off is that it can look odd to readers used to “St.” in prose.

Traditional and editorial

Older house styles keep periods in many abbreviations. In that approach, “Main St.” and “Oak Ave.” signal edited prose. The trade-off is extra punctuation that some readers see as clutter.

Mixed approach

This is the pattern many writers settle on:

• Delivery blocks: no periods.
• Running text: periods for “St.”, “Ave.”, “Blvd.”, plus compass letters like “N.” and “E.” if your style uses them.

Mixed can work well if you stay consistent inside each setting.

Decision Table For Periods After Street Abbreviations

Use this table to pick a rule fast, then stick with it inside the same document.

Where The Street Line Appears	Period After “St”	Notes
Envelope or shipping label	No	Clean lines help scanning; punctuation is often left out.
Form field or database	No	Match the system’s format; keep entries uniform.
Map, directory, signage	No	Short labels read faster at a glance.
News story with a street number	Yes	Many newsrooms use “St.”, “Ave.”, “Blvd.” with periods.
Essay or report in sentence form	Either	Pick the style your class uses; stay consistent.
Reference list entry	Depends	Match the citation style; some drop periods, some keep them.
Email signature street line	No	Looks tidy and copies cleanly into forms.
Invitation or formal letter line	Yes	Periods can match a formal tone in prose lines.

Street Abbreviations Inside Sentences

Once you choose a rule, apply it like any other spelling rule. Here are the spots that trip people up most often.

Commas Around A Street Line

If the street line sits inside a sentence, treat it like any other phrase. Add commas based on sentence structure, not based on the abbreviation. A period on “St.” does not replace a comma after the street line.

Directions Like N, S, E, W

Compass letters can be part of a street line. Some styles write “N.” with a period; others write “N” without one. In delivery blocks, you’ll usually see no periods. In prose, follow your style rule and keep the format the same across all street lines in the piece.

Apartment, Suite, Unit

Unit markers can be written as words (“Apartment 6B”) or short forms (“Apt 6B,” “Ste 200,” “Unit 3”). If you add a period to “Apt.” in prose, do the same for “Ste.” in the same piece. In delivery blocks, many writers drop the period and keep the marker in caps.

Intersections And Plurals

Intersections often show two street types in one line. Pick one pattern and keep it steady:

• Label style: “Main St and Pine Ave”
• Editorial style: “Main St. and Pine Ave.”

For plurals, many writers drop the period and add an “s” (“Sts,” “Aves”) in map captions or quick notes. In edited prose, it may read cleaner to spell the word out (“streets,” “avenues”) unless space is tight.

Saint Versus Street: The “St” Trap

“St” can mean “Street,” but it can also mean “Saint.” That can change punctuation and even capitalization.

When “St” stands for “Saint” in a name like “St Mary’s Church,” many writers skip the period in modern styles. Some styles keep “St.” for “Saint.” Your safest move is to match the spelling used by the place itself if you can. If you can’t, pick one form and keep it consistent inside the same piece.

When “St” stands for “Street,” it usually stays tied to a street name and a street number. If your paragraph mixes both meanings, spelling out one of them (“Saint” or “Street”) can clear up the line fast.

Second-Guess Proofing: A Simple Consistency Check

After you draft, do one pass that checks just these items. It takes two minutes and saves a lot of mixed styling.

1. Search your document for “ St.” and “ St ” and pick one.
2. Do the same for “ Ave.” and “ Blvd.”
3. Scan compass letters: pick “N.” or “N” and keep it.
4. Check unit markers: pick “Apt” or “Apartment” for your setting.
5. Make sure delivery blocks use the clean format you want.

Street Term Forms You’ll See Most Often

This table compares common street terms and the way they are often shown in different writing settings. Use it to keep your choices steady across a page.

Street Term	Delivery Block Form	Prose Form
Street	ST	St. or St
Avenue	AVE	Ave. or Ave
Boulevard	BLVD	Blvd. or Blvd
Road	RD	Rd. or Rd
Drive	DR	Dr. or Dr
Lane	LN	Ln. or Ln
Court	CT	Ct. or Ct
North / South / East / West	N / S / E / W	N. / S. / E. / W. or N / S / E / W

A Practical Rule Set You Can Use Right Away

If you want one clean rule set you can use across school work, blogs, and everyday writing, this set stays readable and avoids mixed signals:

• Use no periods in delivery blocks meant for mail or forms.
• In running text, pick either “St.” style or “St” style and keep it across the whole piece.
• If you follow AP style for numbered street lines, keep the periods on “St.”, “Ave.”, and “Blvd.” in sentences that include the street number.
• When space is not tight, spelling out “Street,” “Avenue,” and “Boulevard” is always safe.

Once you choose a lane, your writing looks clean, and your reader stops noticing the punctuation at all.