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Capital: Denver
Largest City: Denver
Nickname: The Centennial State
Population: 4,753,377 (22nd)
Number of Library Cards: 42
| Denver Public Library |

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| Denver, Colorado |
| Pikes Peak Library District |

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| Colorado Springs, Colorado |
| Arapahoe Library District |

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| Englewood, Colorado |
| Edwin A. Bemis Public Library |

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| Littleton, Colorado |
| Boulder Public Library |

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| Boulder, Colorado |
| Longmont Public Library |

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| Longmont, Colorado |
| Louisville Public Library |

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| Louisville, Colorado |
| Mamie Doud Eisenhower Public Library |

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| Broomfield, Colorado |
| East Cheyenne County Library District |

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| Cheyenne Wells, Colorado |
| Idaho Springs Public Library |

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| Idaho Springs, Colorado |
| John Tomay Memorial Library |

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| Georgetown, Colorado |
| Combined Community Library |

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| Ordway, Colorado |
| Delta County Public Library District |

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| Delta, Colorado |
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