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jeffco.us

https://jeffco.us· First analyzed 29 Apr 2026· Updated 29 Apr 2026
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jeffco.us
Desktop screenshot of jeffco.us
Mobile screenshot of jeffco.us
Mobile

Sponsored

Hosting Provider

Anycast Worldwide

IP Address

159.60.135.5

Site Location

🇺🇸 United Statesvia tld

Server Location

🇳🇱 Amsterdam, The Netherlands

ASN

AS35280

Organization

Anycast Worldwide

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

ns2.f5clouddns.com.ns1.f5clouddns.com.

Performance

73

Core Web Vitals

Weight

First Contentful Paint
5.7 s10%
Speed Index
7.4 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
3.9 MB
89 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Anycast Worldwide
CDN
Cloudflare

Technology Stack

11 Technologies Detected

Libraries

3
jQueryv3.7.1
jQuery UI
Moment.js

Analytics

2
Google Analytics
Google Analytics 4

Frameworks

1
Alpine.js

CSS Frameworks

1
Tailwind CSS

Fonts

1
Google Fonts

Tag Managers

1
Google Tag Manager

CDN

1
Cloudflare

Customer Support

1
Zendesk

SEO Analysis

D59/100
15
11
0
Meta Tags8/15
Content10/12
Headings8/8
Technical15/25
E-E-A-T0/7
Images2/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile3/4
Indexability3/3
J
jeffco.usjeffco.us

Jefferson County, CO | Official Website

The home page for Jefferson County Colorado.

Title Length39 chars

Recommended: 50-60 chars (~237px / 580px)

Description Length44 chars

Recommended: 120-160 chars

Issues (0)

    11 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: standard

    2,244 URLs

    robots.txt

    35 rules

    Local SEO

    Local Search Readiness

    18/100
    Poor
    5 10 2

    This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

    Sponsored

    AI & LLM Readiness

    F37/100
    Bot Access
    20/25
    Machine Read.
    11/25
    Schema Data
    0/25
    Citation
    6/25

    AI Bot Access

    14/14 accessible
    AI Search
    OAI-SearchBot
    PerplexityBot
    Claude-SearchBot
    Gemini-Deep-Research
    DuckAssistBot
    Training
    GPTBot
    ClaudeBot
    Google-Extended
    Meta-ExternalAgent
    Bytespiderinfo
    Amazonbot
    Applebot-Extended
    CCBotinfo
    Fetch
    ChatGPT-User

    Machine Readability

    llms.txt
    llms-full.txt
    Semantic HTML
    Heading Hierarchy
    navheader/footer
    Text ratio:4%
    Words:805
    Token eff.:Optimal
    Sections/1K:9.9
    Depth:2/5

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary10w
    Descriptive Headingsavg 2.5w
    Canonical URL
    Open Graph0/3
    Twitter Card0/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (11)
    AI readiness recommendation preview...
    Upgrade to view recommendations

    Sponsored

    Accessibility

    WCAG 2.1 Compliance

    Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.
    B
    79/100
    14
    Passed
    2
    Critical
    2
    Warnings
    Images & Alt Text
    20/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    17/20
    Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
    Forms & Inputs
    5/15
    Verifies form fields have labels, error messages are clear, and inputs are properly associated.
    Color & Contrast
    15/15
    Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.
    Keyboard & Focus
    13/15
    Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
    ARIA & Roles
    9/15
    Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
    2 recommendations
    • •Accessibility recommendation preview...
    Upgrade to view recommendations

    Carbon Footprint

    SWDM v4 · Eco-Score

    Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.
    15/100
    F
    496 mg
    CO₂e / view
    3.9 MB
    Page Weight
    15%
    Cleaner Than
    New Visitor
    567 mg
    vs
    Returning (cached)
    284 mg
    Annual (10K/mo)
    59.5 kg
    Emission Segments
    Data Center
    111 mg
    Network
    119 mg
    Device
    266 mg
    Resource Breakdown
    JavaScript
    544.5 KB
    Images
    2.2 MB
    CSS
    1.2 MB
    Fonts
    4.5 KB
    HTML
    24.6 KB
    Other
    25.9 KB
    Green Hosting Not Verified
    Anycast Worldwide
    7 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    B

    Security Score

    71%Good
    Interactive

    HTTPS

    WAF

    37d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Google Trust Services

    Key Algorithm

    ECDSA (secp256r1) (256 bit)

    Signature

    ECDSA with SHA-256

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/2

    Valid From

    08.03.2026

    Valid Until

    06.06.2026

    OCSP Stapling

    Enabled

    Subject Alternative Names (1)

    www.jeffco.us

    SHA-256 Fingerprint

    AB:E1:92:87:83:0F:1A:C0:7F:D8:C9:0F:20:66:1A:0A:83:4D:3C:5D...

    Top Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    cache-control
    🟡 30s(public, max-age=30)
    cf-cache-status
    EXPIRED
    cf-ray🇮🇹 Milan
    9f413d46eda6eea5-MXP
    content-encoding
    📦 Gzip(gzip)
    content-security-policy
    frame-ancestors 'self' https://*.granicus.com https://platfo...
    content-type
    text/html; charset=utf-8
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    73

    SPF
    DKIM
    DMARC

    DMARC Policy

    Quarantine (Moderate)

    MX Records (2)

    mxb-0010c902.gslb.pphosted.com
    mxa-0010c902.gslb.pphosted.com

    Domain Information

    jeffco.us

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookie Consent Banner
    Privacy Policy
    Terms of Service

    GDPR Indicators

    Privacy policy page linked

    Mobile Compatibility

    Viewport & Responsive Test

    Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.
    C
    64/100
    Mobile Friendly1 breakpoint
    Viewport Meta
    The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.
    Responsive Design
    Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.
    Touch Icons
    Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.
    Readable Font Size
    Base font size should be at least 16px on mobile to ensure text is readable without zooming.
    Relative Units
    Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.
    No H-Scroll Risk
    No elements wider than the viewport that would cause horizontal scrolling on mobile devices.
    Tap Targets OK
    Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.
    No Fixed Widths
    No elements with fixed pixel widths that could overflow on smaller screens and break the layout.
    Viewport
    width=device-width, initial-scale=1
    2 recommendations
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    Aleo + Open Sans

    WCAG Partial
    65/100
    Readability
    /30
    20/30

    15px · LH 1.50

    Hierarchy
    /20
    17/20

    2.5x ratio · ✓ H1→H6

    WCAG
    /25
    15/25

    1.03:1 min contrast

    Performance
    /25
    13/25

    System fonts

    Heading Font

    Aleo

    Sans38px

    Body Font

    Open Sans

    Sans15px

    Contrast Ratio

    1.03:1

    25 issues

    Reading Comfort

    Dual Sans-Serif

    left aligned
    38px
    h1
    42px
    h2
    20px
    h3
    20px
    h4
    15px
    p

    ⚠️ Small text: 15px may strain on mobile. Use ≥16px for WCAG compliance.

    ✅ Optimal line spacing: 1.50 ratio (ideal range 1.4–1.6).

    ⚠️ Partial contrast: 25 elements below WCAG AA threshold (min 1.0:1).

    ✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

    ✅ Strong hierarchy: Headlines are 2.5x larger than body text.

    ✅ System fonts: Zero font loading delay — best possible LCP impact.

    GGoogle Fonts

    Color Palette

    10 unique colors
    13.3:1 AAA Light
    #ffffff
    Background· 20.3%
    #2c3129
    Secondary· 3.6%
    #3c5955
    Primary· 0%
    #122f4f
    Accent· 23%
    #a78c63
    Secondary· 15.399999999999999%
    #7f7453
    Secondary· 11.6%
    #534b25
    Secondary· 8.1%
    #77663d
    Secondary· 7.1%

    Business & Marketing Stack

    3 Tools Detected

    Advanced

    Behavior Analytics

    2
    Google Tag ManagerFree
    Google AnalyticsFree

    User behavior and product analytics

    Social Media

    1
    Facebook SDKFree

    Social widgets and sharing tools

    2

    Categories

    3

    Total Tools

    0

    Enterprise

    0

    Mid-Market

    Assessment: Well-developed marketing technology stack

    Sponsored

    Scripts & Styles

    30 Resources

    20
    Scripts
    10
    Styles
    7
    Async
    3
    Defer

    Top Script Sources

    local(12)googletagmanager.com(3)siteimproveanalytics.com(1)google-analytics.com(1)docaccess.com(1)

    Website Identity

    jeffco.us

    303-271-6511
    Location detected: 🇺🇸 United Statesvia tld
    en

    Sponsored

    Last analyzed: 29 Apr 2026 at 21:01

    Historical Analysis & Change Tracking