Toggle navigation
Search
Main navigation
Games
Roman Numeral Challenge
Math Flashcards
Hangman
Same Game
Tic Tac Toe
1010 Classic
MergeIt
Simon Says
Word Searches
This or That Polls
Quizzes & Trivia
World
Countries
World History & Timelines
World Stats & Facts
War
Current Events
World Geography
Religion
Natural Disasters
Accident Archive
U.S.
U.S. History
Government
U.S. Geography
Education
Laws & Rights
National Landmarks
The Fifty States
U.S. Cities
U.S. Population
Race & Ethnicity
Postal Information
Speeches & Documents
U.S. State Flags
Timelines
People
People Fun Facts
Biographies
Women of Influence
U.S. Presidents
Math & Science
Math
Biology
Earth Sciences
Environment, Energy, and Nature
Health and Body
Dinosaurs
Inventions and Inventors
Chemistry
Physics
Weather
Food
General Science
Computers, Technology and the Internet
Transportation
Astronomy and Space
Language Arts
Creature Catalog
All About Books
Grammar and Spelling
Speaking of Language
Mythology
Homework
Geography
History
Language Arts
Mathematics
Science
Social Studies
Writing
Research
Speaking & Listening
Studying
Tools
Almanac
Atlas
Conversion Calculator
Dictionary
Distance Calculator
Encyclopedia
Place Finder
Spell Checker
Thesaurus
Teaching Resources
ADVERTISEMENT
/
U.S.
/
Population
Cite
Pennsylvania: Persons under 18 years old, percent
Source information
✖
