Radius Targeting Explained: Setup & Best Practices

Radius targeting, also known as proximity targeting, is an advertising technique that shows ads to consumers when they are within a specific circular distance of a central point. Marketers use this method to reach mobile users near a store, service area, or landmark to drive foot traffic and local conversions.

What is Radius Targeting?

Radius targeting is the most fundamental form of geofencing. To implement it, an advertiser places a virtual pin dropped on a physical address or coordinate and defines a boundary (e.g., 5 miles) around it. When a user’s mobile device enters this circular zone, they become eligible to see the advertiser’s content.

While traditional geo-targeting might cover broad areas like entire cities or zip codes, radius targeting focuses on proximity. The [global location-based advertising market is projected to reach $356.67 billion by 2033] (Amazon Advertising), [growing at a 14.23% compound annual growth rate (CAGR)] (Amazon Advertising). This growth is supported by consumer behavior, as [80% of consumers share location data in exchange for personalized marketing] (Amazon Advertising).

Why Radius Targeting matters

• Operational Alignment: Businesses like pizza shops or home repair services can limit ads to their specific delivery or service zones, ensuring they do not pay for clicks from customers they cannot serve.
• Hyper-local Relevance: Advertisers can communicate directly with consumers at opportune moments, such as a restaurant sending a lunch offer to people within 5 miles at 11:30 AM.
• Budget Efficiency: Focusing spend on the most accessible customer base reduces "noise" and increases the likelihood of a sale.
• Enhanced Personalization: Tailoring ad copy to the specific neighborhood or proximity of the user creates a more resonant message for the on-the-go consumer.

How Radius Targeting works

The process involves selecting a central anchor and defining the reach. Different platforms have specific technical requirements.

Standard Setup Steps

1. Define the Center: Select an address, search by business name, input latitude and longitude coordinates, or use an interactive map pin.
2. Set the Distance: Choose the radius size. GroundTruth allows customization down to a .25-mile radius, while Google Ads requires a minimum of 1 mile (or 1 kilometer). Amazon DSP allows ranges between 2 to 100 miles.
3. Choose Targeting Logic: Decide whether to target people based on "Presence" (physically in the area) or "Presence or Interest" (physically there or searching for the area).
4. Verification: Use interactive map interfaces to visualize include and exclude zones, ensuring coverage does not overlap with areas you want to avoid.

Platform Variations

Best practices

• Adjust bid modifiers: Increase your bids for areas closest to your business and decrease them for the outer edges of the radius where conversion likelihood may be lower.
• Use location-specific copy: Reference the neighborhood or use phrases like "Visit us nearby" to increase click-through rates (CTR).
• Analyze performance data: Monitor metrics like cost per acquisition (CPA) and conversion rate specifically for the radius to see if the boundary is too wide or too narrow.
• Match language to location: Ensure your ad language matches the primary language of the targeted geographic area to remain consistent and relevant.
• Combine with "Presence or Interest" for Search: In specific industries like travel or real estate, marketers see [+5% more conversions on Search campaigns when switching to "Presence or Interest"] (Google Ads Support) instead of targeting "Presence" only.

Common mistakes

• Setting a radius too small: If the target is too narrow, the ad may show intermittently or not at all because it fails to meet privacy and targeting thresholds.
  • Fix: Increase the radius to at least 1 mile or 1 kilometer if impressions are low.
• Ignoring the "Parking Lot" effect: Physical addresses were built for directions, but a business entrance might be far from the street or across a large parking lot.
  • Fix: Use latitude and longitude coordinates or manual map pins for more precise centering.
• Overlapping Exclusions: Accidentally excluding a city that falls within your target radius can cause ads to stop serving in high-value zones.
  • Fix: Use the visual map interface to double-check that your "Exclude" areas do not conflict with your primary radius.
• Using radius for Hotel Ads: Some campaign types have technical restrictions.
  • Fix: Note that Google Hotel Ads campaigns cannot be targeted by radius; use individual cities or regions instead.

Examples

• Scenario (Luxury Dealership): A luxury car dealership targets a 15-mile radius around a high-income residential neighborhood rather than its own physical location. This ensures ads are seen by the demographic most likely to buy, regardless of where the showroom is located.
• Scenario (Quick Service Restaurant): A local cafe sets a 2-mile radius and uses bid modifiers to pay 20% more for users within the first mile during the hours of 7:00 AM to 10:00 AM.
• Scenario (Service Area Business): A plumbing company that only travels up to 20 miles sets a 20-mile radius around their headquarters. This prevents their ad from appearing to users 30 miles away who they cannot service.

FAQ

What is the smallest radius I can target?

Platforms vary. Most major search platforms require at least a 1-mile or 1-kilometer radius. However, some specialized location platforms allow you to go as small as .25 miles. If you need a smaller area on Google, try switching your units to 1 kilometer, which is slightly smaller than 1 mile.

Is radius targeting 100% accurate?

No. Targeting is based on a variety of signals, including device settings, user behavior, and platform data. Because these signals vary, accuracy cannot be guaranteed in every situation. Advertisers should monitor overall performance metrics to ensure the settings are meeting their goals.

When should I use "Presence" vs. "Presence or Interest"?

Use "Presence" if you are in a sensitive vertical with strict limitations or if you only want to reach people physically inside the boundary. Use "Presence or Interest" if you want to capture customers who are searching for your location from elsewhere, such as a tourist in Chicago searching for "hotels in Madrid."

Can I target multiple locations at once?

Yes. Platforms like Google Ads and Amazon DSP allow you to upload bulk locations (up to 1,000 at a time). You can paste address lists or coordinates into the advanced settings to set multiple radii simultaneously across several campaigns.

How does radius targeting differ from geofencing?

Radius targeting is a type of geofencing that creates a simple circle around a point. Advanced geofencing can involve "polygons," which are custom-drawn shapes that follow specific street borders or property lines for more precision.